y(x+y)+(x+y)(x-y)-x² 提公因式 1.y(x+y)+(x+y)(x-y)-x的平方2.x(b+c-d)-y(d-b-c)-2c+2d-2b3.2(a-3)平方-a+34.6a(b-a)平方-2(a-b)立方5.x(b+c-d)-y(d-b-c)-2c+2d-2b6.不解方程组2x+y=6 求代数式7y(x-3y)平方-2(3y-x)立方 x-3y=1
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y(x+y)+(x+y)(x-y)-x² 提公因式
1.y(x+y)+(x+y)(x-y)-x的平方
2.x(b+c-d)-y(d-b-c)-2c+2d-2b
3.2(a-3)平方-a+3
4.6a(b-a)平方-2(a-b)立方
5.x(b+c-d)-y(d-b-c)-2c+2d-2b
6.不解方程组2x+y=6 求代数式7y(x-3y)平方-2(3y-x)立方
x-3y=1 求代数式的值
1.(x+y)x-x2=x(x+y-x)=xy
2.xb+xc-xd-yd+yb+yc-2c+2d-2b=(x+y-2)(b-d+c)
3.(a-3)(2a-7)
4.(a-b)平方(4a+2b)
5.(x+y-2)(b+c-d)
6.化为(3y-x)平方(y+2x)则(-1)平方*6=6
1:原式=yx+y2+x2-y2-x2=xy
其他都一样,很简单
{(x,y) |x|+|y|
x>y?x:y
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x y x+yy x+y xx+y x y
(3x-y)(3y+x)-(x-y)(x+y)
化简x/y(x+y)-y/x(x+y)
化简 x / y(x+y) - y / x(x+y) =
化简:(x+ y)(x-y) +(x+ y) +(x-y)
x+y
(x+y)
|x+y|
x y x+yy x+y xx+y x y
化简y(x+y)+(x+y)(x-y)-x^2
|x|+|y|