还有一题:
Y1=3X+1 Y2=4X-0.5,Y1=2Y2,求X等于
还有一题:
Y1=3X+1 Y2=4X-0.5,Y1=2Y2,求X等于
3*(x+5)+5[(X+5)-1]-1=7*(X+5)
3*(x+5)+5(x+5)-6=7*(X+5)
x+5=6
x=1
因为Y1=2Y2
所以3x+1=2(4x-0.5)
3x+1=8x-1
5x=2
x=0.4
3*(x+5)+5[(x+5)-1]=7*(x+5)
→3x+15+5x+20-1=7x+35
→(3x+5x)+(15+20-1)=7x+35
→8x+34=7x+35
移项,得:8x-7x=34-35
→x=-1