题目

计算:-|||-(1) dfrac (ny)(mx)cdot dfrac (my)(nx)-|||-;(2) dfrac (12x)(7y)div 8(x)^2y-|||-;(3) dfrac ({x)^2-2x+1}({x)^2-1}div dfrac (x-1)({x)^2+x}-|||-;(4) ((-dfrac {3b)(2a))}^2计算：(1) 计算:-|||-(1) dfrac (ny)(mx)cdot dfrac (my)(nx)-|||-;(2) dfrac (12x)(7y)div 8(x)^2y-|||-;(3) dfrac ({x)^2-2x+1}({x)^2-1}div dfrac (x-1)({x)^2+x}-|||-;(4) ((-dfrac {3b)(2a))}^2 (3 计算:-|||-(1) dfrac (ny)(mx)cdot dfrac (my)(nx)-|||-;(2) dfrac (12x)(7y)div 8(x)^2y-|||-;(3) dfrac ({x)^2-2x+1}({x)^2-1}div dfrac (x-1)({x)^2+x}-|||-;(4) ((-dfrac {3b)(2a))}^2 4 计算:-|||-(1) dfrac (ny)(mx)cdot dfrac (my)(nx)-|||-;(2) dfrac (12x)(7y)div 8(x)^2y-|||-;(3) dfrac ({x)^2-2x+1}({x)^2-1}div dfrac (x-1)({x)^2+x}-|||-;(4) ((-dfrac {3b)(2a))}^2

计算：(1) $%5Cfrac%7Bny%7D%7Bmx%7D%5Ccdot%20%5Cfrac%7Bmy%7D%7Bnx%7D%3B%282%29%5Cfrac%7B12x%7D%7B7y%7D%5Cdiv%208x%5E%7B2%7Dy$ (3 $%29%5Cfrac%7Bx%5E%7B2%7D-2x%2B1%7D%7Bx%5E%7B2%7D-1%7D%5Cdiv%20%5Cfrac%7Bx-1%7D%7Bx%5E%7B2%7D%2Bx%7D$ 4 $%28-%20%5Cfrac%7B3b%7D%7B2a%7D%29%5E%7B2%7D$

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