已知a⼀2=b⼀2≠0,求代数式5a-2b⼀a눀-4b눀×(a-2b)的值

2024-12-20 15:59:42
推荐回答(4个)
回答1:

a/2=b/2≠0,
则a=b≠0
5a-2b/a²-4b²×(a-2b) (5a-2b是分子,a²-4b²是分母吧)
=[(5b-2b)/(b²-4b²)]×(b-2b)
=3/(-3)×(-1)
=1

回答2:

∵a/2=b/2≠0
∴a=b≠0
∴(5a-2b)/(a²-4b²)×(a-2b)
=(5a-2a)/(a²-4a²)*(a-2a)
=3a/(-3a²)×(-a)
=-3a²/(-3a²)
=1

回答3:

a=b≠0
(5a-2b)/(a²-4b²)×(a-2b)
=3a/(-3a²)×(-a)
=1

回答4:

所以a=b
代入,原式=5a-2/a-4a²*(-a)=4a^3+5a-2/a