Bài1: Tính nhanh A:14.25.6.7 B:125.98.2.8.25 23/08/2021 Bởi Maria Bài1: Tính nhanh A:14.25.6.7 B:125.98.2.8.25
`a, A = 14 . 25 . 6 . 7` `= (14 . 7) . (25 . 6)` `= 98 . 150` `= 14700` `b, B = 125 . 98 . 2 . 8 . 25` `= (125 . 8) . (2 . 25) . 98` `= 1000 . 50 . 98` `= 50000 . 98` `= 4900000` Bình luận
a) 14 . 25 . 6 . 7 = 2 . 7 . 25 . 6 = (2 . 25 . 6) . 7 . 7 = 300 . 49 = 14 700 b) 125 . 98 . 2 . 8 . 25 = (125 . 8) . (25 . 2) . 8 = 1000 . 50 . 98 = 50000 . 98 = 4 900 000 Bình luận
`a, A = 14 . 25 . 6 . 7`
`= (14 . 7) . (25 . 6)`
`= 98 . 150`
`= 14700`
`b, B = 125 . 98 . 2 . 8 . 25`
`= (125 . 8) . (2 . 25) . 98`
`= 1000 . 50 . 98`
`= 50000 . 98`
`= 4900000`
a) 14 . 25 . 6 . 7
= 2 . 7 . 25 . 6
= (2 . 25 . 6) . 7 . 7
= 300 . 49
= 14 700
b) 125 . 98 . 2 . 8 . 25
= (125 . 8) . (25 . 2) . 8
= 1000 . 50 . 98
= 50000 . 98
= 4 900 000