作业帮4x-3y=-6,4x+3y=3,21x+4y=?
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4x-3y=-6,4x+3y=3,21x+4y=?
4x-3y=-6,4x+3y=3,21x+4y=?
4x-3y=-6,4x+3y=3,21x+4y=?
4x-3y=-6,4x+3y=3,21x+4y=21*(-3/8)+4*(3/2)=6-63/8=-15/8;
x=-3/8,y=3/2,21x+4y=-15/8
..
21x+3y=3(4x-3y)+3(3x+4y)=3*(-5)+3*3=-6 4x—3y=-5 3x+4y=3 两式相加的 7x+y=-2 两边*3得-6 4x—3y=-5每项*3 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)-4(x-y)=4 {x+y/2 + x-y/6=1
（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
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y
(-x+6):(x-y);(4x+y)=3;14:1,求x+y的值.
（3x-y)(y+3x)-(4x-3y)（4x+3y)=?
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
（5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x(x-3y)=4y(x-3y),求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