Question

将方程(2X+1)-(y+3)=x+y变形为用舍x的算式表示y,并分别求当x=-2,0.1,5分之2时相应的y的值

Answer 1

(2x+1)-(y+3)=x+y

2x+1-y-3=x+y

2y=x-2

y=(x-2)/2

当x=-2时,y=-2

当x=0.1时,y=-0.95

当x=2/5时,y=-4/5