Question

解方程.X＋4分之1X＝620X－7分之2X＝450 (1－7分之1)X＝12 X(1＋5分之1)＝787X(x＋2分之

Answer 1

1.x+1/4x=620

5/4x=620

x=620*4/5

x=496

2.（1-1/7)x=450

6/7x=450

x=450*7/6

x=525

3.(1+1/5)x=78

6/5x=78

x=78*5/6

x=65

4.7(x+1/2)=49/ 6

7x+3.5=49/6

7x =49/6-21/6

7X=28/6

X=28/6*1/7

x=2/3

5.1/2-4/5X=1/10

4/5x=5/10-1/10

4/5x=4/10

x=4/10*5/4

x=1/2