y-7x=49x-y=16
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y-7x=49x-y=16
y-7x=4
9x-y=16
y-7x=49x-y=16
y-7x=49x-y=16
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
5X+16X= Y+9Y= X+7X-4X=
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=?
解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16
y=x(x
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
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
方程组 x+5y+2=06x-7y=16x=y=