先化简在求值4a方-5ab-6b方分之a方-3ab+2b方除以a-2b分之2a方-2ab其中a=1 b=1/2

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化简此仿(4a+3b)(a-2b)分之(a-b)(a-2b)除以(a-2b)分森歼纤之2a(a-b)=2a(4a+3b)分之(a-2b) 代改贺入数就自己做吧(*^_^*)

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