作者goodromhome

30÷2(x+3)÷5=0.6
30÷2(x+3)=0.6x5
30÷2(x+3)=3
2(x+3)=30÷3
2(x+3)=10
x+3=10÷2
x+3=5
x=5-3
x=2

30÷2(x+3)÷5=0.6
30÷2(x+3)=0.6x5
30÷2(x+3)=3
30÷(x+3)=3x2
30÷(x+3)=6
x+3=30÷6
x+3=5
x=5-3
x=2