2000x*0.8=0.7(4+x) 做糊涂了
问题描述:
2000x*0.8=0.7(4+x) 做糊涂了
答
题目呢
答
2000x*0.8=0.7(4+x)
1600x=2.8+0.7x
(1600-0.7)x=2.8
1599.3x=2.8
x=28/15993