Question

2. Găsește rapid fiecare rezultat, grupând convenabil factorii.
5 x 23 x 4 = (5 x 4) 23 = 20 x 23 = 23 x 20 = 460
2
I
2 x 971 x 5 x 2 x 2 x 5 x 5 =
20 x 2 x 86 x 25 x 2 x 5 =
2 x 37 x 50 =

Answer 1

2x37x50=(2x50)x37=100x37=3700.

2x971x5x2x2x5x5=(20×5×2×5)×971=1000x971=971.000

20x2x86x25x2x5=(20x5)x(2×2×25)×86=100x100x86=860000