作业帮x+y+4=50 40-x+36-x=y
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x+y+4=50 40-x+36-x=y
x+y+4=50 40-x+36-x=y
x+y+4=50 40-x+36-x=y
解方程吗?
x+y+4=50 x+y=46
40-x+36-x=y 2x+y=76
x=30
y=16
两式左边加左边等于右边加右边，解得x=-30，再将x的值带入第一个式子中，解得y=76。
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+y+4=50 40-x+36-x=y
化简 x / y(x+y) - y / x(x+y) =
X+Y=40,(X*Y)/(X+Y)=7.5
x+x+x+y=60 .x-y=4
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+x+y=52 y+y+y+x=36求x
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
y=x(x
x+x+x+x+y=40 x+y= 13x=y=
(x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11
y=x+4/x (x