(a+a+a)+(3+2+4)=219
(a x 3)+9=219
(a x3)=219-9=210
a x 3 =210
a =210:3
a =70
(a+a+a)+(2+3+4)=219
3a+9=219
3a=219-9=210
a=210:3=70
Ta có:
( a + 2 ) + ( a + 3 ) + ( a + 4 ) =219
( a + a + a) + ( 2 + 3 + 4 ) = 219
a x 3 + 9 = 219
a x 3 = 219 - 9
a x 3 = 210
a = 210 : 7
a = 30
[a+a+a]+[2+3+4]=219
[a*3] + 9 =219
a*3 =219-9
a*3 =210
a =210:3
a 70
ban thu lai xem co dung khong