帮我做2道数学方程(1)6x-7y-40=0 5y-2x+8=0(2)(x+y)/2+(x-y)/3=6 2(x+y)-
帮我做2道数学方程(1)6x-7y-40=0 5y-2x+8=0(2)(x+y)/2+(x-y)/3=6 2(x+y)-
请帮我做几道方程1、x+2y=0 3x+4y-6=02、3x+2y=-2 3x-y=43、6x+7y=-19 5y-6x
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
解题解方程式Y=3X+2Y=5X+4Y=7X+6Y=9X+8Y=11X 大家帮我看看这是个什么方程?是不定式方程吗?如何
不解方程2x+y=6,x-3y=1,求7y(x-3y)^2-2(3y-x)^3 的值
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+2
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,