Question

Tính hợp lý: 13 . 32 + 87 . 32 + 139 . 28 - 39 . 28

Answer 1

\(13.32+87.32+139.28-39.28\)

\(=32.\left(13+87\right)+28.\left(139-39\right)\)

\(=32.100+28.100\)

\(=3200+2800\)

\(=6000\)

Answer 2

13 . 32 + 87 . 32 + 139 . 28 - 39 . 28

= 32 . (13 + 87) + (139 - 39) . 28 = 32 . 100 + 100 .  28 = 3200 + 2800 = 6000