Question

X 2X 5X 10X=810,怎么解方程

Answer 1

x-4/5x=20

1/5x=20

x=20*5

x=100

2/3x+1/2x=49

(2/3+1/2)x=49

(7/6)x=49

x=49÷(7/6)

x=42

75+7/10x=102

7/10x=102-75=27

x=27÷(7/10)

x=270/7

2x+9/2=12

2x=12-9/2=15/2

x=(15/2)÷2

=15/4