3x-2y=11,4x+3y=9如题
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3x-2y=11,4x+3y=9如题
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
初一数学题求(x+y)(2x-y)-(x+2y)(x-2y)的值,其中x=3,y=4如题
如题{(X,Y)|(X+2)2+|Y-3|=0,X,Y属于R}=
如题{(X,Y)|(X+2)²+|Y-3|=0,X,Y属于R}=
根据3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
5x-(1-11y)/8=5y-6x+2/9=3x+4y+7/6如题,财富值不够,请见谅
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
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解方程x+2y-9=0 3x-y+1=0如题