0.4(y-0.2)+1.5=0.7y-0.38
0.4(y-0.2)+1.5=0.7y-0.38
解方程 0.4(y-0.2)+1.5=0.7y-0.38
Y.
4分之x-y=﹣1 x+4y=4,求x,y 0.2x+0.5y=5分之1 0.4x+0.1y=5分之2,求x,y
1.5y+8y-6y=2y-3
y -0.4y=28.8
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值
【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&
x+y=200 (100×1×x):(100×1.5×y)=3:4
计算 (y-0.3)/2=(0.7y+0.5)/0.5-1.5
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x.y满足(x-y+2>=0.x+y-4>=0.2x-y-5<=0),求Z=[x+2y-4]的最大值……补充:[]为