Question

tính nhanh

a, 15 * 3 + 15 * 7 + 15

b, 24 * 18 - 24 * 7

Answer 1

a, = 15 x (3+7) + 15 = 15 x 10 + 15 = 150 + 15 = 165

b, = 24 x 18 - 24 x 8 + 24 = 24 x (18-8) + 24 = 24 x 10 + 24 = 240 + 24 = 264

k mk nha

Answer 2

a,15*3+15*7+15

=15*(3+7)

=15*10

=150

b,24*18-24*7

=24*(18-7)

=24*11

=264

tk cho mk nha^-^