x+y=22 2.5x+7y=100
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x+y=22 2.5x+7y=100
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
7x:4y,x:y=( ):(
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
1.5(x+y)+3(x-y)=27(x+y)-3(x-y)=-62.x-y/7 - x+y/10 =1/22(x-y)-5(x+y)=3所谓细节决定成败,
x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
x+2y=2x+y+1=7x-y 求:2x-y?
当x+y=2时7(x+y)一(x+y)+(x+y)=?
x^2+y^2=15,x+y=7,x>y,求x-y
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
{5x-2y=7y+2x 3x+2y=22