x^2-y^2=6,x+y=3则x-y=?
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x^2-y^2=6,x+y=3则x-y=?x^2-y^2=6,x+y=3则x-y=?x^2-y^2=6,x+y=3则x-y=?x^2-y^2=(x+y)(x-y)=6x+y=3所以x-y=6÷3=2x
x^2-y^2=6,x+y=3则x-y=?
x^2-y^2=6,x+y=3则x-y=?
x^2-y^2=6,x+y=3则x-y=?
x^2-y^2=(x+y)(x-y)=6
x+y=3
所以x-y=6÷3=2
x^2-y^2=(X+y)*(x-y)=6;
所以x-y=2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
（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
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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
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(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
若2x=3y,则(x*x+y*y)/x*x=?