作业帮3x+6y=35 x+y=12 x.y各等于多少 急
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3x+6y=35 x+y=12 x.y各等于多少 急
3x+6y=35 x+y=12 x.y各等于多少 急
3x+6y=35 x+y=12 x.y各等于多少 急
x=三分之三十七
(80%Y-X)×8=(Y-35-X)×12 化简得：
2(0.8y-x)=3(y-x-35)
1.6y-2x=3y-3x-105
x-1.4y=-105
-x+y=45
两式相加得：
-0.4y=-60
y=150
x=105
方程组的解是：x=105；y=150
y=-1/3 x=12 1/3
3x+6y=35 x+y=12 x.y各等于多少 急
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
12y(x-y)^2-8(x-y)^3=?
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
化简 x / y(x+y) - y / x(x+y) =