6x-(6x-3x+8y-3y)=70怎么解
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6x-(6x-3x+8y-3y)=70怎么解
6x-(6x-3x+8y-3y)=70
6x-3x-5y=70
3x-5y=70
不定方程有无数解
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
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
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
4x-3y/x-2y÷6y-8x/y-2x
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项.
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=?