2Y:30%=3X:50%
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2Y:30%=3X:50%
求X:Y
求X:Y
因为
2Y:30%=3X:50%
所以
3x*30%=2y*50%
所以0.9x=y
x:y=1:0.9=10:9
楼上错啦
2Y:30%=3X:50%
所以
3x*30%=2y*50%
所以0.9x=y
x:y=1:0.9=10:9
楼上错啦
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
1.x+y+z=30,3x+y-z=50,x,y,z为非负数,求5x+4y+2z取值范围.
|x|+|y|=30 2|x|-3|y|=20 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
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
解方程组x+y+z=30,3x+2y+z=50
x+y+z=30 3x+2y+z=50
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
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