Bài Làm:
1.
a) 4 x 5 x 3 = (4 x 5) x 3 = 20 x 3 = 60
4 x 5 x 3 = 4 x (5 x 3) = 4 x 15 = 60
b) 3 x 5 x 6 = (3 x 5) x 6 = 15 x 6 = 90
3 x 5 x 6 = 3 x (5 x 6) = 3 x 30 = 90
2.
a) 13 x 5 x 2 = 13 x 10 = 130 |
b) 5 x 2 x 34 = 10 x 34 = 340 |
c) 2 x 26 x 5 = 26 x 10 = 260 |
d) 5 x 9 x 3 x 2 = 10 x 27 = 270 |
3.
a) 999 x 5 x 2 = 9990
b) 999 x 7 x 2 > 9990
c) 999 x 4 x 2 < 9990