Tính nhanh 8.9.14+6.17.12+19.4.18
Giải thích
8 . 9 .14 + 6 .17 .12+ 19 .4 . 18
= 8 . 9 . 14 + 6. 12 + 4 . 18 .19
=72 . 14 + 72 . 17+ 19 . 72
=72 .14+ 17 +19=72 . 50
= 3600
8 . 9 .14 + 6 .17 .12+ 19 .4 . 18
= 8 . 9 . 14 + 6. 12 + 4 . 18 .19
=72 . 14 + 72 . 17+ 19 . 72
=72 .14+ 17 +19=72 . 50
= 3600