{3x-4y=10 3x=2y+4解
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{3x-4y=10 3x=2y+4解
{3x-4y=10 3x=2y+4解<<<二元一次方程组
{3x-4y=10 3x=2y+4解
3x=2y+4
代入3x-4y=10
2y+4-4y=10
2y=-6
所以
y=-3
x=(2y+4)/3=-2/3
3x-4y=10·······a
3x=2y+4·······b
b带入a得
2y+4-4y=10
2y=-6
y=-3
x=-2/3
祝学习进步,望采纳~~
3x-4y=10……1
3x=2y+4……2
2代入1得
2y+4-4y=10
-2y=6
y=-3
x=-2/3
3x-4y=10 (1)
3x-2y=4 (2)
(1)-(2)得
-2y=6
解得:y=-3
把y=-6代入(2)得3x+6=4,即3x=-2
解得x=-2/3
所以方程组的解为x=-2/3,y=-3。
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。
解方程组,x+y/2=3x-2y=10+6x+y/4,
3(x+y)+4(x-y)=36 2(x+y)=-10的解!
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1
3x+x+4y+(90+10)x=3y-(2x+y)+510y=34x
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
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
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11