(0.5x-1)*3-8y=-x+0.5y=-7
求代数式3x²y+5x-0.5x²y+3.5x²y-2的值,其中x=1/5,y=7
(0.5x-1)*3-8y=-x+0.5y=-7
2分之1x=y 2x=3分之2y 0.5分之y=3分之x 7分之x=3分之y 5x+2=y 0.7y=x 他们成什么例?
求值.(3x-y)(3x+y)-(2x+3y)(3y+2x),其中x=-1,y=0.5用平方差公式
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
y=2x^2-4x-8 y=0.5x^2+2x-1
9y=3x-(x-1),4(x+y)-(2x+4)=8y
Matlab编程问题 cos(x*y)*cos(x*(1-y))-0.5x*sin(x*y)*sin(x*(1-y))=
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y