2x+3y-1=x+6 { y-x-8=x+6(二元一次方程) 3x+2y=1 2x-2y+2z=-5 x+2y-z=3(三元一次)x+2y=-112x/0.5-10=y(二元一次)
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2x+3y-1=x+6 { y-x-8=x+6(二元一次方程) 3x+2y=1 2x-2y+2z=-5 x+2y-z=3(三元一次)x+2y=-112x/0.5-10=y(二元一次)
2x+3y-1=x+6 { y-x-8=x+6(二元一次方程) 3x+2y=1 2x-2y+2z=-5 x+2y-z=3(三元一次)
x+2y=-11
2x/0.5-10=y(二元一次)
2x+3y-1=x+6 { y-x-8=x+6(二元一次方程) 3x+2y=1 2x-2y+2z=-5 x+2y-z=3(三元一次)x+2y=-112x/0.5-10=y(二元一次)
x+2y=-11
2x/0.5-10=y(二元一次)
x+2y=-11 x=-11-2y
4x-10=y 4x-10=y 4(-11-2y)-10=y y=-6
x=1
2x+3y-1=x+6 { y-x-8=x+6
2x+3y-1=x+6 x=7-3y
y-x-8=x+6
y-7+3y-8=7-3y+6 7y=13+15 y=4
x=-5
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
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
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
2x+3y-1=y-x-8=x+6 ,y=?
2x+3y-1=y-x-8=x+6,则x=
9y=3x-(x-1),4(x+y)-(2x+4)=8y
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-x+y/y-(x+y)(x-y)/y² y/x=2
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
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
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题
(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
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20