计算题:
(1)??1?25?0.05????14?4 ?5(2)43?1?2??2.2????6.9 5?10?3(3)
1913?23?4.5 1122(4)
35?62??????1.2 7?75?(5)21?1???1.6?1? 3?5?2?55????80%
3?1216?(6)3?1??15(7)
11?1???4?0.5? 2?3?3?21?71?????? 4?53?82(8)
1531(10)5?3?0.5
442111?2 (11)1.25?(2?)?52411(12)3?(5.75?2)
42(9)5??5 (13)2
5341÷×. 6918(14)31?12?2.7
25(15)71?12?10
3333(16)2.5???22?1
???353?6?(17)
215?1?2?40%?0.4 5714(18)
153?4?? 36211?(6.75?2) 24(19)81551(20)(??)?32
168497235(21)28?3?3?(8?6)
21?1 363151?3 (23)?(2.5?)?44125(22)2.75?13(24)?1.4?
4512??10(25)8?7.4???2?
35??3(26)5?0.4?5?5 612(27)
2?3?13??1.1???? 15?4?37(28)3?(29)2131?2?1 3551?1???3?1??0.8 2?3?111?(4?0.5) 2332171(31)?(?)??
45382(30)
355??1 412632(33)1–?3?
831473(34)(?)?
15242(32)(35)?2?12??1?75%??1.6 ?45?56??2?? 3?(36)?2.4?1.6??3?(37)?2?12??1?0.4??30?23? (38)
8?1?1??1.5???2?0.75 15?4?12(39)4
117-+0.125 1285341(40)2÷×
691897235???(?) (41)
283386136?3 331141(43) 3.2???75%
35(42) 2.625?5769555(45) 20?(??)
236(46)
(44) 36?(?)?40%
4?15????0.25? 5?2?(47)
531??124333?0.75 4515(49)7.25?1.4?
7534(50)5?2??
64557?14 (51)?630(48)1?(52)
17?173????1? 18?184?118111??? 693221211(54)??
3530(53)(55)41?31???2?? 2?42?3512(56)8??1
(57)1?133? 454(58)
4?151????? 5?24?16413??? 35343171? (60)?5204537(61)??
648212(62)3?1?
363112(63)5?1?2
635755? (64)?91218523(65)??
8516(59)(66)33?11???2?? 4?64?24? 35245(68)??
35712(69)1?0.25?2
432(70)3?1.25?2.125
3311(71)??1
5321115(72)13?1?
5522(67)4?(73)2.5???21????2 ?53?(74)23?1?2??2.2????6.9 5?10?3482??2 591523? (76)1.75?22111(75)
(77)?2?37???1.5??12 ?48?3414?1? 57(78)4.8?1?1.75?4(79)17?111???1?0.35??10?1 15?5512??3?85?? 6?(80)24???0.25?解方程: 1
(1)2.1:x=:5
3
(2)(2x-5):3=7 (3)2x?41?8.5 3143?1:5 (4)5x:(5)x∶12=2(6)2.1:x?1122∶3. 52 54542(7)x?7??1
39153(8)2x:3?(x?1):4
23x?0.4??1 35(10)x:(6?x)?2:3 (9)
13 242(12)3︰x=2︰12
5(11)4:x?1:3(13)x∶12=2122∶3. 53?1:5 (14)5x:(15)2142:x?30%:1.5 5151∶8 4(16)x∶1=6(17)3:x?1341:1 93