7/4x-1/2x=6.26 7x+402x乘2=21 解方程

问题描述:

7/4x-1/2x=6.26 7x+402x乘2=21 解方程

7/4x-1/2x=6.26
5/4x=6.26
x=6.26÷1.25
x=5.008
7x+402x乘2=21
7x+804x=21
811x=21
x=21/811

x=5.008
x=38.62

两边乘以20
35x-10x=125.2
25x=125.2
x=5.008
7x+402x*2=21
811x=21
x=38.62