问题标题:
【(b-2a)^2÷(-b/a)*(-3b/4a)^3(x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1(b-2a)^2÷(-b/a)*(-3b/4a)^3(x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1】
问题描述:
(b-2a)^2÷(-b/a)*(-3b/4a)^3(x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1
(b-2a)^2÷(-b/a)*(-3b/4a)^3
(x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1
李西峰回答:
(b-2a)^2÷(-b/a)*(-3b/4a)^3
=(2a-b)²×(-a/b)×(-27b³/64a³)
=27b²(2a-b)²/64a²
(x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1
=(x-1)/(x+2)×(x+2)(x-2)/(x-1)²×(x+1)(x-1)
=(x-2)(x+1)
=x²-x-2
陈金海回答:
Sorry,第一题题目打错了,应该是(b/2a)^2÷(-b/a)*(-3b/4a)^3
李西峰回答:
(b/2a)^2÷(-b/a)*(-3b/4a)^3=b²/4a²×(-a/b)×(-27b³/64a³)=27b的次方/256a的4次方
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