例8:
2a 1 a b ÷ b a b b 42
2
解: 2a 1
a b ÷ b a b b 4 4a 2 1 a 4 = 2 × b a b b b 2 2 4a 4a 4a 4a ( a b) = 2 2 = 2 2 b ( a b) b b ( a b) b ( a b)
4a 2 4a 2 + 4ab 4ab 4a = = 2 = 2 b ( a b) b (a b) b(a b) =?
例8:
2a 1 a b ÷ b a b b 42
2
解: 2a 1
a b ÷ b a b b 4 4a 2 1 a 4 = 2 × b a b b b 2 2 4a 4a 4a 4a ( a b) = 2 2 = 2 2 b ( a b) b b ( a b) b ( a b)
4a 2 4a 2 + 4ab 4ab 4a = = 2 = 2 b ( a b) b (a b) b(a b) =?
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