=23.25﹣(6.75+3.25), =23.25﹣10, =13.25
(50)125×3.2×2.5, =125×8×0.4×2.5,
=(125×8)×(0.4×2.5), =1000×1, =1000;
(51)3.6×10.1, =3.6×(10+0.1), =3.6×10+3.6×0.1, =36+0.36, =36.36;
(52)5.8×2.7+0.58×73, =5.8×2.7+5.8×7.3, =5.8×(2.7+7.3), =5.8×10, =58;
(53)3.6+6.4×1.8, =3.6+11.52, =15.12; (54)(1.48+3.02)÷(3.6×0.5),=4.5÷1.8, =2.5; (55)(36.7﹣4.9)×101﹣31.8, =31.8×101﹣31.8, =31.8×(101﹣1), =31.8×100, =3180
(56)6.33×101﹣6.33 =6.33×(101﹣1), =6.33×100, =633;
(57)35.6﹣5×1.73, =35.6﹣8.65, =26.95;
(58)1.6×55.4﹣55.4×0.6, =55.4×(1.6﹣0.6), =55.4×1, =55.4;
(59)17.68÷5.2+2.7×1.5, =3.4+4.05, =7.45
(60)1.08×0.8÷0.27 =1.08÷0.27×0.8, =4×0.8, =3.2;
(61)102×0.45 =(100+2)×0.45,
小数混合运算---
=100×0.45+2×0.45, =45+0.9, =45.9;
(62)22.78÷1.25÷0.8 =22.78÷(1.25×0.8), =22.78÷1, =22.78;
(63)0.34×101﹣0.34 =(101﹣1)×0.34, =100×0.34, =34
(64)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10;
(65)0.8×6.3﹣0.8×3.8, =0.8×(6.3﹣3.8), =0.8×2.5, =2;
(66)504÷3.2×2.08, =157.5×2.08, =327.6; (67)(20﹣0.8×9)×5.7, =(20﹣7.2)×5.7, =12.8×5.7, =72.96
(68)2.4×1.5+3.6÷1.5, =3.6+2.4, =6;
(69)7.38﹣5.14+3.62﹣2.86, =(7.38+3.62)﹣(5.14+2.86), =11﹣8, =3;
(70)0.12×1.8+8.2×0.12, =0.12×(1.8+8.2), =0.12×10, =1.2;
(71)5.4÷[0.51÷(1.2﹣1.03)], =5.4÷[0.51÷0.17], =5.4÷3, =1.8;
(72)[(8.1﹣5.6)×0.9﹣1.05]÷0.04,=[2.5×0.9﹣1.05]÷0.04, =[2.25﹣1.05]÷0.04, =1.2÷0.04, =30
(73)10.8﹣0.8÷(0.35+0.05), =10.8﹣0.8÷0.4, =10.8﹣2,
21
=8.8;
(74)8×[1÷(2.3﹣2.25)], =8×[1÷0.05], =8×20, =160;
(75)2.64×9.9+0.264, =0.264×99+0.264, =0.264×(99+1), =0.264×100, =26.4;
(76)4.52+0.61+1.39+6.48 =(4.52+6.48)+(0.61+1.39), =11+2, =13;
(77)4.27﹣(1.96﹣1.73) =4.27﹣0.23, =4.04; (78)(294.4﹣19.2×6)÷(6+8) =(294.4﹣115.2)÷14, =179.2÷14, =12.8;
(79)12.5×0.76×0.4×8×2.5
=(12.5×8)×(0.4×2.5)×0.76, =100×1×0.76, =76.
(80)4.98+8.02×2.5, =4.98+20.25, =25.03;
(81)60.8﹣40.8÷2.5, =60.8﹣16.32, =44.48;
(82)0.8×69.6×12.5, =(0.8×12.5)×69.6, =10×69.6, =696;
(83)4.98×99+4.9, =493.02+4.9, =497.92;
(84)6.48÷3.2÷2.5, =6.48÷(3.2×2.5), =6.48÷8, =0.81;
(85)1.2×7.6+7.6×6.8, =7.6×(1.2+6.8), =7.6×8, =60.8 (86)(9.4﹣5.8)×2.07, =3.6×2.07,
小数混合运算---
=7.452;
(87)12.54﹣4.56﹣3.44﹣1.54, =(12.54﹣1.54)﹣(4.56+3.44), =11﹣8, =3;
(88)(9.36×5+9.36+9.36×2)×1.25, =9.36×(5+2+1)×1.25, =9.36×8×1.25, =9.36×(8×1.25), =93.6;
(89)7.236÷0.18﹣14.3×0.02, =40.2﹣0.286, =39.914.
(90)9.6÷0.4×0.25, =24×0.25, =6;
(91)29.7÷(5.85÷0.65), =29.7÷9, =3.3;
(92)7.4×9.9, =7.4×(10﹣0.1), =7.4×10﹣7.4×0.1, =74﹣0.74, =73.26;
(93)3.84﹣2.7×0.64, =3.84﹣1.728, =2.112;
(94)8.68﹣8.68÷0.56×0.5, =8.68﹣15.5×0.5, =8.68﹣7.75, =0.93;
(95)4.7×4.7+4.7+4.3×4.7, =4.7×(4.7+4.3+1), =4.7×10, =47
(96)2.72÷[(8.2﹣6.5)×0.5] =2.72÷[1.7×0.5], =2.72÷0.85, =3.2;
(97)9.12+9.12×9﹣60.2 =(1+9)×9.12﹣60.2, =10×9.12﹣60.2, =91.2﹣60.2, =31;
(98)28.4÷0.4÷0.25 =28.4÷(0.4×0.25), =28.4÷0.1, =284;
22
(99)27.36﹣27.36÷7.6 =27.6﹣3.6, =24
(100)3.25×0.45+6.75×0.45, =0.45×(3.25+6.75), =0.45×10, =4.5;
(101)31.5﹣24.5÷3.5, =31.5﹣7, =24.5;
(102)7.5×102, =7.5×(100+2), =7.5×100+7.5×2, =750+15, =765;
(103)6.3+3.7×2.8, =6.3+10.36, =16.66.
(104)2.15+8.73+1.27+7.85 =(2.15+7.85)+(8.73+1.27), =10+10, =20;
(105)11.87﹣(8.2+1.87), =11.87﹣1.87﹣8.2, =10﹣8.2, =1.8;
(106)5.42﹣3.87﹣1.13, =5.42﹣5, =0.42;
(107)4.38﹣1.56+0.62﹣0.44, =(4.38+0.62)﹣(1.56+0.44), =5﹣2, =3;
(108)0.4×270×2.5, =(0.4×2.5)×270, =270; (109)(40+1.25)×8, =40×8+1.25×8, =320+10, =330; (110)(12.5﹣0.05)×8, =12.5×8﹣0.05×8, =100﹣0.4, =99.6;
(111)2.6×8.5+8.5×7.4, =(2.6+7.4)×8.5, =85;
小数混合运算---
(112)9.9×6.9﹣6.9×3.9, =(9.9﹣3.9)×6.9, =6×6.9, =41.4;
(113)5.6×99+5.6, =5.6×(99+1), =560;
(114)2.5×(1.9+1.9+1.9+1.9), =2.5×4×1.9, =10×1.9, =19;
(115)7.2÷1.25÷8, =7.2÷8÷1.25, =0.9÷1.25, =0.72.
(116)52.4﹣(15+0.6)÷1.6, =52.4﹣15.6÷1.6, =52.4﹣9.75, =42.65;
(117)9.87×99+9.87, =9.87×(99+1), =987;
(118)46.8÷0.9÷0.4, =46.8÷(0.9×0.4), =46.8÷0.36, =130;
(119)5.5×17.3+6.7×5.5, =5.5×(17.3+6.7), =5.5×24, =132
(120)99×4.2+4.2 =4.2×(99+1), =4.2×100, =420;
(121)0.25×1.25×3.2 =0.25×1.25×(4×0.8), =0.25×4×(1.25×0.8), =1×1, =1;
(122)6.4×14+15×6.4+6.4 =6.4×(14+15+1), =6.4×30, =192; (123)(1.3+1.3×0.125×8)÷(80﹣77.4)=(1.3+1.3×1)÷2.6, =2.6÷2.6, =1;
(124)4×(25+2.5+0.25)÷111 =(4×25+4×2.5+4×0.25)÷111,
23
=(100+10+1)÷111, =111÷111, =1;
(125)6.25÷[(17.2﹣3.6×4.5)÷0.32] =6.25÷[(17.2﹣16.2)÷0.32], =6.25÷(1÷0.32), =6.25÷3.125, =2
(126)28.4×99+28.4, =28.4×(99+1), =28.4×100, =2840.
(127)0.94×2.5﹣0.45, =2.35﹣0.45, =1.9.
(128)4×0.8×12.5×2.5, =(4×2.5)×(0.8×12.5), =10×10, =100.
(129)17.5÷0.25×17+13, =70×17+13, =1190+13, =1203
(130)10.1×87, =(10+0.1)×87, =87+8.7, =95.7;
(131)2.3+3.19÷(22﹣19.8), =2.3+3.19÷2.2, =2.3+1.45, =3.75;
(132)1.25×7.2, =1.25×8×0.9, =10×0.9, =9
(133)9.1﹣1.2÷6﹣6.24 =9.1﹣0.2﹣6.24, =8.9﹣6.24, =2.66;
(134)7.3+12.8﹣3.8×2.3 =20.1﹣8.74, =11.36; (135)(5.36+7.64)÷13×100 =13÷13×100, =100;
(136)7.575÷[(5.63﹣1.88)×0.2] =7.575÷[3.75×0.2], =7.575÷0.75, =10.1
小数混合运算---
(137)7.5﹣(5.5+1.24), =7.5﹣5.5﹣1.24, =2﹣1.24, =0.76;
(138)0.26+15.68+9.74+2.32, =(0.26+9.74)+(15.68+2.32), =10+18, =28;
(139)13.26+9.55﹣3.26, =13.26﹣3.26+9.55, =10+9.55, =19.55;
(140)6.1+3.9﹣6.1+3.9, =6.1﹣6.1+(3.9+3.9), =0+7.8, =7.8
(141)31.7÷0.63≈50.32; (142)2.4×1.5+3.6÷1.5 =3.6+2.4, =6;
(143)0.32×0.25+0.08÷4 =0.08+0.08÷4, =0.08+0.02, =0.08+0.02, =0.1; (144)(9.6+1.48÷3.7)÷8 =(9.6+0.4)÷8, =10÷8, =1.25;
(145)5.8÷[4×(1.34﹣0.14)] =5.8÷[4×1.2], =5.8÷4.8, ≈1.21;
(146)5.4÷[0.51÷(1.2﹣1.03)] =5.4÷[0.51÷0.17], =5.4÷3, =1.8
(147)21.35﹣3.25﹣16.75, =21.35﹣(3.25+16.75), =21.35﹣20, =1.35;
(148)33.02﹣(148.4﹣90.85)÷2.5,=33.02﹣57.55÷2.5, =33.02﹣23.02, =10;
(149)32×2.5×0.125, =4×8×2.5×0.125,
=(4×2.5)×(8×0.125),
24
=10×1, =10;
(150)18.1+(3﹣0.299÷0.23)×1, =6.12×100,
=612;
(162)8.6÷0.86+8×0.35, =18.1+(3﹣1.3)×1, =18.1+1.7×1, =18.1+1.7, =19.8
(151)67﹣(2.98+0.67), =67﹣3.65, =63.35;
(152)8×16﹣73.8×6, =128+442.8, =570.8; (153)(45+14)÷73+710, =59÷73+710, =
+710, =710
(154)13.7×0.125×8, =13.7×(0.125×8), =13.7×1, =13.7;
(155)0.8×[13﹣(3.12+5.28)],=0.8×[13﹣8.4], =0.8×4.6, =3.68;
(156)102×0.56, =(100+2)×0.56, =100×0.56+2×0.56, =56+1.12, =57.12;
(157)1.53×1.7+0.47×1.7, =(1.53+0.47)×1.7, =2×1.7, =3.4
(158)5.18+0.73+0.82,. =(5.18+0.82)+0.73, =6+0.73, =6.73;
(159)0.75×1.8÷1.5, =1.35÷1.5, =0.9;
(160)12.5×7.1×0.8, =(12.5×0.8)×7.1, =10×7.1, =71;
(160)6.12×99+6.12, =6.12×(99+1),
小数混合运算---
=10+2.8, =12.8;
(163)5.6×(18.5﹣8.5÷0.5), =5.6×(18.5﹣17), =5.6×1.5, =8.4
(164)0.125×4.78×80, =0.125×4.78×8×10,
=(0.125×8)×(4.78×10), =1×47.8, =47.8;
(165)2.8×3.6+1.4×2.8, =2.8×(3.6+1.4), =2.8×5, =14; (166)(0.4+40)×2.5, =0.4×2.5+40×2.5, =1+100, =101;
(167)78.7﹣17.7×3.6, =78.7﹣63.72, =14.98;
(168)18÷[0.3×(8﹣6.5)], =18÷[0.3×1.5], =18÷0.45, =40;
(169)12.7+12.5+0.5, =12.7+(12.5+0.5), =12.7+13, =25.7
(170)91÷2.6÷0.05, =35÷0.05, =700;
(171)6.3×3.7+6.3×6.3, =6.3×(3.7+6.3), =6.3×10, =63; (172)(3.7+1.7×0.4)÷2.5, =(3.7+0.68)÷2.5, =4.38÷2.5, =1.752;
(173)7.28+3.2÷2.5, =7.28+1.28, =8.56;
(174)0.74+0.9×7.4,
25