x-40%x+4=80%怎么算
问题描述:
x-40%x+4=80%怎么算
答
x-40%x+4=80%
x-0.4x+4=0.8x
0.2x=4
x=20
x-40%x+4=80%怎么算
x-40%x+4=80%
x-0.4x+4=0.8x
0.2x=4
x=20