3X-2Y)(X+Y)-X(3X-Y),其中X=2/3,Y=9/2 9(X-3)(X-2)-5(X-5)(2X-1)+3(X+1)(3X-4)其中X=-1/2
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3X-2Y)(X+Y)-X(3X-Y),其中X=2/3,Y=9/2 9(X-3)(X-2)-5(X-5)(2X-1)+3(X+1)(3X-4)其中X=-1/2
3X-2Y)(X+Y)-X(3X-Y),其中X=2/3,Y=9/2
9(X-3)(X-2)-5(X-5)(2X-1)+3(X+1)(3X-4)其中X=-1/2
3X-2Y)(X+Y)-X(3X-Y),其中X=2/3,Y=9/2 9(X-3)(X-2)-5(X-5)(2X-1)+3(X+1)(3X-4)其中X=-1/2
1
(2-9)(2/3+9/2)-[3(2/3)^2+(2/3)(9/2)]
=-7*(31/6)-13/3
=-243/6
2
全部打开 原式=9x^2-45x+54-10x^2+55x-25+9x^2-3x-12
=8x^2+7x+17
=8*(1/4)+7(-1/2)+17
=31/2
x(x-y)2-(y-x)3
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
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化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
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(-2x y)^2-(3y-x)(-x-3y)
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