Question

Вычисли удобным способом.
5x7x4=
37x7+23x7=
25x86x4=
42+42+42+42+42=

Answer 1

5*7*4 =(5*4)*7=20*7=140
37*7 + 23*7 = 7*(37 + 23)= 7 * 60 = 420
25 * 86 * 4 = (25 * 4) * 86 = 100 * 86 = 8600
42+42+42+42+42 = 42 * 5 = 210