Question

解方程,一定要准确,1/(4/5x-1/5)=3 （x+4）/9=27还有3x-12=48-7x 4:x=8:6

Answer 1

x在分子上：

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

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

1=12x/5-3/5

5=12x-3

x=2/3

(x+4）/9=27

x+4）=9×27

x+4=243

x=239