分式化简求值(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²,其中a=1,b=-2,c=-3.答案清晰一些.
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![分式化简求值(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²,其中a=1,b=-2,c=-3.答案清晰一些.](/uploads/image/z/1746533-29-3.jpg?t=%E5%88%86%E5%BC%8F%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%88a%26%23178%3B-ab%2Fa%26%23178%3B%2Bab-ac%EF%BC%89%C3%97%7B%28a-b%29%26%23178%3B-c%26%23178%3B%7D%2F2ab%2Ba%26%23178%3B%2Bb%26%23178%3B%7D%C3%B7%7Ba%26%23178%3B-%28b-c%29%26%23178%3B%7D%2Fa%26%23178%3B-b%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D-2%2Cc%3D-3.%E7%AD%94%E6%A1%88%E6%B8%85%E6%99%B0%E4%B8%80%E4%BA%9B.)
分式化简求值(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²,其中a=1,b=-2,c=-3.答案清晰一些.
分式化简求值
(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²,其中a=1,b=-2,c=-3.
答案清晰一些.
分式化简求值(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²,其中a=1,b=-2,c=-3.答案清晰一些.
题目的括号乱打,乱丢.做这种题,括号就和你身上的衣服一样,希望我没有理解错你乱打乱丢的括号
(a²-ab/a²+ab-ac)×{(a-b)²-c²}/2ab+a²+b²}÷{a²-(b-c)²}/a²-b²
=(a-b)/(a+b-c)*(a-b+c)(a-b-c)/(a+b)^2*(a-b)(a+b)/[(a-b+c)(a+b-c)]
=(a-b)/(a+b-c)*(a-b-c)/(a+b)*(a-b)/(a+b-c)
=(a-b)^2(a-b-c)/[(a+b)(a+b-c)^2]
代入数值
原式=3^2*6/[(-1)*2^2]=-54/4=-27/2
先化简,再代值 [(x+2)/(x 2;-2x) – (x-1)/(x 2;-4x+4)][(x+2)/(x 2;-2x) – (x-1)/(x 2;-4x+4)]÷(x 2;-16)/
[(a²-ab)/(a²+ab-ac)]×{[(a-b)²-c²]/(2ab+a²+b²)}÷{[a²-(b-c)²]/(a²-b²)}其中a=1,b=-2,c=-3.
原式=[(a-b)/(a+b-c)]×[(a-b+c)(a-b-c)/(a+b)²]×[(a+b)(a-b)/(a+b-c)(a-b+c]
=(a-b)²(a-b-c)/(a+b)(a+b-c)²=(9×6)/[(-1)(4)]=-54/4=-27/2