1/ 15 - 3(x + 2) = 3
=> 3(x + 2) = 15 - 3
=> 3(x + 2) = 12
=> x + 2 = 12 : 3
=> x + 2 = 4
Vậy x = 2
2/ 17.6 + 80.6 + 6.3
= 6 (17 + 80 + 3)
= 6 . 100
= 600
câu 1 15-3.(x+2)=3
3.(x+2)=15-3
3.(x+2)=12
x+2=12:3
x+2=4
x=4-2
x=2
Câu 2 17.6 + 80.6 + 6.3
= 6. (17+3+80)
=6. 100
= 600
Câu 3 32.5 + 7.2 - 23.5
=9.5 + 7.2 - 8.5
= 45+ 14 - 40
=59 -40
=19