3x+3y+2x-2y=36 4x+4y-5x-5y=2
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3x+3y+2x-2y=36 4x+4y-5x-5y=2
3x+3y+2x-2y=36 4x+4y-5x-5y=2
3x+3y+2x-2y=36 4x+4y-5x-5y=2
3x+3y+2x-2y=36 ①
4x+4y-5x+5y=2 ②
(3x+2x)+(3y-2y)=36
5x+y=36
y=36-5x③
把③带入②得,
-x+9(36-5x)=2
x=7
把x=7带入③得
y=1
∴此方程组的解为x=7,y=1
3x+3y+2x-2y=36 4x+4y-5x-5y=2
5x+y=36, -x-y=2
x+y=-2
4x=38
x=19/2
y=-23/2
你想要表达神马意思,要是求解的话,x=19.5;y=-21.5
1式:3x+3y+2x-2y=36
5x+y=36
y=36-5x
2式:4x+4y-5x-5y=2
-x-y=2
y=-2-x.代入1式:
5x-2-x=36
4x-2=36
4x=38
x=38/4
x=9.5
把X=9.5代入Y=-2-X
Y=-2-9.5
Y=-11.5
首先化简。
5x+y=36①
-x-y=2 ②
①+②,得
4x=38③,得出x=38/4,化简得x=19/2。
把x代入②
-19/2-y=2,解得
y=-23/2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
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
(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
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
(x+3y-4)(2x-y)
计算(2x-3y)(x+4y)-(3x+y)(x-2y)(2x-3y)(x+4y)-(3x+y)(x-2y)
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?