Question

Số?

a) 104 x 7  = 7 x

b) 9 x 30 =( + 10) x 9

c) (6 x 15) x 21 = 6 x ( x 21)

d) 23 x 3 x 4 = 4 x  = 12 x 

Answer 1

a)

104 x 7 = 7 x 104

b)

9 x 30 = (20+10) x 9

c)

(6 x 15) x 21 = 6 x (15 x 21)

d)

23 x 3 x 4 = 4 x 69= 12 x 23

Answer 2