(1)y=2x-3,3x+2y=6 (2)2x+y=5,3x-4y=2 这两个都是二元一次方程现在就要!一定要正确!呜呜呜呜呜!明要交!
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(1)y=2x-3,3x+2y=6(2)2x+y=5,3x-4y=2这两个都是二元一次方程现在就要!一定要正确!呜呜呜呜呜!明要交!(1)y=2x-3,3x+2y=6(2)2x+y=5,3x-4y=2
(1)y=2x-3,3x+2y=6 (2)2x+y=5,3x-4y=2 这两个都是二元一次方程现在就要!一定要正确!呜呜呜呜呜!明要交!
(1)y=2x-3,3x+2y=6 (2)2x+y=5,3x-4y=2 这两个都是二元一次方程
现在就要!一定要正确!呜呜呜呜呜!明要交!
(1)y=2x-3,3x+2y=6 (2)2x+y=5,3x-4y=2 这两个都是二元一次方程现在就要!一定要正确!呜呜呜呜呜!明要交!
y=2x-3 (1)
3x+2y=6 (2)
将(1)代入(2)得
3x+4x-6=6
解得x=12/7
代入(1)得y=3/7
则x=12/7 y=3/7
2x+y=5 (1)
3x-4y=2 (2)
(1)*4+(2)得
11x=22
解得x=2
代入(1)得y=1
则x=2 y=1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
(x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(3x-y)^2+(3x+y)(3x-y),x=1,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
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
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1