x+3.5x=90怎么算?

问题描述:

x+3.5x=90怎么算?

4.5x=90
x=90/4.5
x=20

x+3.5x=90
4.5x=90
x=90/4.5
x=20

(1+3.5)x=90
4.5x=90
x=90÷4.5
x=20

x+3.5x=90
4.5x=90
x=90×4.5
=20