(2X-3Y)(?)=-4X^+9Y^````
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(2X-3Y)(?)=-4X^+9Y^````(2X-3Y)(?)=-4X^+9Y^````(2X-3Y)(?)=-4X^+9Y^````=-2X-3Y
(2X-3Y)(?)=-4X^+9Y^````
(2X-3Y)(?)=-4X^+9Y^
````
(2X-3Y)(?)=-4X^+9Y^````
= -2X-3Y
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
9y=3x-(x-1),4(x+y)-(2x+4)=8y
根据3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
3(x+y)+2(x-y)=36 4(x+y)-5(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
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(2X-3Y)(?)=-4X^+9Y^````
如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y=如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y=
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2