2/x+3/y=1/2,2/x+﹙x+1﹚/y=1,这个二元一次方程怎么解,
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3x(2x+y)-2x(x-y),其中x=1,y=1/5
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
先化简,再求值:[(x+y)(x-y)-(x-y)²+2y(x+y)]除4y,其中x=2,y=1
函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
【x+y】【x-y】+【x-y】²-【x²-3xy】,其中x=2,y=1/2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)
方程组 2x+3y-1=x+6 y-x-8=x+6 怎么解,
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)]
求下列值域y=x^2-3x+2/x^2-1y=x^2+x+1/x^2-x+1
y=0.5x(x+2)(3x-1) 求x轴交点.
不解方程组{2x+Y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
先化简,再求值:[x(x-2y)-(x+y)(x-y)]÷(-1/2y),其中x=1/2,y=-1.
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51