3x-2y=11 4x-5y=3
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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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快
(x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
根据3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
(3x-2y)(4x-5y)-11(x+y)(x-y)+5xy,已知X=3又1/2,y=2又1/3
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话