2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15

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2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15

2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15

X等于十分之十九，Y等于十分之十七，希望帮到你了

先去括号得:
①2x+2y-3×-3y=-x-y=3
②4x+4y+3x-3y=7x+y=15
本题是二元一次方程组:
②式+①式得:
6x=18
x=3
再把算出来的x代到y的式子中:
y=-6
如果对你有帮助的话！记得给好评哦

x=2，y=1

(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 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)=11 4(x+y)+3(x-y)=9 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? (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) 已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y)