Question

Bài 2: Tính nhanh:

a)   4   x   76   +   76   x   7

b)  4   x   54   +   54   x   2   +   5   x   54

c)   37   +   3   x   37   +   5   x   37   +   2   x   37

Answer 1

a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370

Answer 2

a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370

Answer 3

a) 4 x 76 + 76 x 7

= (4 + 7) x 76

= 11 x 76

= 836.

b) 4 x 54 + 54 x 2 + 5 x 54

= (4 + 2 + 5) x 54

= 11 x 54

= 594.

c) 37 + 3 x 37 + 5 x 37 + 2 x 37

= 37 x (3 + 5 + 2 + 1)

= 37 x 11

= 407.