怎么解x-2y=5 2x-y=4

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怎么解x-2y=52x-y=4怎么解x-2y=52x-y=4怎么解x-2y=52x-y=4根据第一个式子得到：x=5+2y代入第二个式子得2(5+2y)-y=410+4y-y=43y=-6y=-2∴x

怎么解x-2y=5 2x-y=4
怎么解x-2y=5 2x-y=4

怎么解x-2y=5 2x-y=4
根据第一个式子得到：x=5+2y
代入第二个式子得2(5+2y)-y=4
10+4y-y=4
3y=-6
y=-2
∴x=5-4=1

3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? X+y=15 2x-y=5y-x怎么解二元二次方程(x+y)(x-2y)=-5,(x-y)(x+2y)=7 怎么解二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 X+Y=5.7 1/4X+2/5Y=4/5X 怎么解由X/Y=2Y/X-Y 怎么解得x=2y? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 {2X=5(X+Y)3X-10(X+Y)=2怎么解? 3x*5y+2x*6y=2.7*(3x+2x)怎么解三元一次方程组x-2y=5,4x-y+3z,2x+y=0怎么解 2x=y 3y=x怎么解 (x/y)2-(x/y)=1怎么解? 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 x*x+2x+y*y-4y+5=0 x= y= 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