3(2x-y)+4(x-2y)=87 2(3x-y)-3(x-y)=82 这个二元一次方程组怎么解3(2x-y)+4(x-2y)=872(3x-y)-3(x-y)=82这个二元一次方程组怎么解要过程
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3(2x-y)+4(x-2y)=87 2(3x-y)-3(x-y)=82 这个二元一次方程组怎么解3(2x-y)+4(x-2y)=872(3x-y)-3(x-y)=82这个二元一次方程组怎么解要过程
3(2x-y)+4(x-2y)=87 2(3x-y)-3(x-y)=82 这个二元一次方程组怎么解
3(2x-y)+4(x-2y)=87
2(3x-y)-3(x-y)=82
这个二元一次方程组怎么解要过程
3(2x-y)+4(x-2y)=87 2(3x-y)-3(x-y)=82 这个二元一次方程组怎么解3(2x-y)+4(x-2y)=872(3x-y)-3(x-y)=82这个二元一次方程组怎么解要过程
3(2x-y)+4(x-2y)=87
化简:6x-3y+4x-8y=87
10x-11y=87①
2(3x-y)-3(x-y)=82
化简:6x-2y-3x+3y=82
3x+y=82
y=82-3x②
代②入①
10x-11(82-3x)=87
10x-902+33x=87
43x=989
x=23
∴y=82-3×23=13
即:方程组的解为x=23;y=13
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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
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)=11 4(x+y)+3(x-y)=9
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=?
解方程3(2X-Y)+4(X-2Y)=87 2(3X-Y)-3(X-Y)+82
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y