化简(2x+3y)(x-2y)-(2x+y)(2x-y)
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化简(2x+3y)(x-2y)-(2x+y)(2x-y)
化简(2x+3y)(x-2y)-(2x+y)(2x-y)
化简(2x+3y)(x-2y)-(2x+y)(2x-y)
(2x+3y)(x-2y)-(2x+y)(2x-y)
=2x^2-xy-6y^2-4x^2+y^2
=6x^2-xy-5y^2
=(6x+5y)(x-y)
-2x^2-3xy-5y^2
=(2x+3y)(x-2y)-4x的平方-y的平方
=2x的平方-xy-6y的平方-4x的平方-y的平方
=-2x的平方-xy-7y的平方
-2x^2-3xy-5y^2
-2x^2-xy-5y^2 (唯一正确答案,后面用平方差公式)
(x-y)²-(x+y)² 分解因式就是-4xy唦,直接展开不就得了。。要理解分解因式的概念,就是将多项式展开成因式乘积的形式。学数学脑子要灵活变通,不要受固定思维影响~
化简((X-2Y)的平方+(X-Y)(x+Y)-2(X-3Y)(X-Y))除以Y
把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
化简2x-(5x-3y)+(7x-y)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
因式分解x²(x-2y)+y²(2y-x)
化简(2x+3y)(x-2y)-(2x+y)(2x-y)
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
先化简再求值 [(x-y)²+(x+y)(x-y)]÷2x,其中x=3,y=1
1/2x-(x+y/2x -x-y)÷(x+y)
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
2(x-y)²-3(x-y)(-y-x)
已知x+y=-2,试计算1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y的值
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚
[(x+2y)(x-2y)+4(x-y)²]÷6x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x