x/(1+20%)+(1600-x)/(1-30%)=1500 解这个方程,
问题描述:
x/(1+20%)+(1600-x)/(1-30%)=1500 解这个方程,
答
x/1.2+(1600-x)/0.7=1500
0.7x+1.2(1600-x)=1500x1.2x0.7
1920-0.5x=1260
0.5x=660
x=660/0.5
x=1320
答
x/1.2+(1600-x)/0.7=1500
0.7x+1.2(1600-x)=1500x1.2x0.7
0.7x+1920-1.2x=1260
1920-0.5x=1260
0.5x=660
x=660/0.5
x=1320