Question

解下列方程 1)4分之7x-5=8分之3 2)2分之1x-7=6分之9x-2 3)3分之2x+1-6分之5x-1=1

Answer 1

(1) 7x/4-5=3/8

7x/4=43/8

x= 43/14

(2) x/2 -7 = 9x/6 -2

3x/6 - 9x/6 = 7-2

-x = 5

x=-5

(3) (2x+1)/3 - (5x-1)/6 = 1

(4x-2)/6 - (5x-1)/6 = 1

(4x-2-5x+1)=6

-x -1=6

x=-7

(4) 3(200+x)/10 - 2(300-x)/10 = 300×9/25

600+3x-600+2x = 3000×9/25

5x = 1080

x=216