约分:1:m²+m-20分之16m-m³ 2:-a²+4ab-4b²分之4b²-a² 一定要对啊!
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约分:1:m²+m-20分之16m-m³ 2:-a²+4ab-4b²分之4b²-a² 一定要对啊!
约分:1:m²+m-20分之16m-m³ 2:-a²+4ab-4b²分之4b²-a² 一定要对啊!
约分:1:m²+m-20分之16m-m³ 2:-a²+4ab-4b²分之4b²-a² 一定要对啊!
解1题:
原式=(16m-m³)/(m²+m-20)
=[-m(m²-16)]/[(m+5)(m-4)]
=[-m(m+4)(m-4)]/[(m+5)(m-4)]
=-m(m+4)/(m+5)
解2题:
原式=(4b²-a²)/(-a²+4ab-4b²)
=(a²-4b²)/(a²-4ab+4b²)
=[(a+2b)(a-2b)]/(a-2b)²
=(a+2b)/(a-2b)