解方程7+x+4x=78
问题描述:
解方程7+x+4x=78
答
71/5
答
7+5x=78
5x=71
x=71/5
答
x=14.2
答
5x=71
x=71/5
答
7+x+4x=78
5x+7=78
5x=78-7
5x=71
x=71/5
x=14.2
答
5x=71
x=14.2