小敏在解方程2x+5=x+7时,是这样写解得过程的:2x+5=x+7=2x-x=7-5=x-2
人气：138 ℃ 时间：2020-09-09 06:59:04
解答
4(X+1)^2-(2X+5)(2x-5)=4(X^2+2X+1)-4X^2+25=8X+263(Y-Z)^2-(2Y+Z)(-Z+2Y)=3(Y^2-2YZ+Z^2)-(4Y^2-Z^2)=4Z^2-6ZY-Y^2=[X(X^2Y^2-XY)-Y(X^2-x^3Y)]÷3X^2Y=(X^2Y(XY-1)-YX^2(1-XY)}/3X^2Y=(XY-1)(X^2Y+X^2Y)/3X^2Y=2/3...
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