10*20%+5%*2x=10%*(x+2x+10) 12%x+(30-x)*14%=4 60*2*(1+25%)÷(2+2*50%)=50

问题描述:

10*20%+5%*2x=10%*(x+2x+10) 12%x+(30-x)*14%=4 60*2*(1+25%)÷(2+2*50%)=50
(1+50%)x+(150-x)*(1+10%)=170

(1)2+x/10=3/10x+1
x/5=1
x=5
(2)3/25x+21/5-7/50x=4
1/5=1/50x
x=10
(3)未知数不见了
(4)1.5x+165-1.1x=170
0.4x=5
x=12.5