Question

Wiedząc , że 35 x 82 = 2870 , oblicz :

a) 36 x 82 =...............
b) 35 x 83 = ..............
c) 35 x 81 =...............
d) 34 x 82 =...............

Answer 1

A) 36 x 82 = 35 * 82 + 1 * 82 = 2870 + 82 = 2952
b) 35 x 83 = 35 * 82 + 1 * 35 = 2870 + 35 = 2905
c) 35 x 81 = 35 * 82 - 1 * 35 = 2870 - 35 = 2835
d) 34 x 82 = 35 * 82 = 1 + 82 = 2870 - 82 = 2788

Answer 2

Wiedząc , że 35 x 82 = 2870

a) 36 x 82 = (35 + 1) x 82 = 35 x 82 + 1 x 82 = 2870 + 82 = 2952
b) 35 x 83 = 35 x (82 + 1) = 35 x 82 + 35 x 1 = 2870 + 35 = 2905
c) 35 x 81 = 35 x (82 - 1) = 35 x 82 - 35 x 1 = 2870 - 35 = 2835
d) 34 x 82 = (35 - 1) x 82 = 35 x 82 - 1 x 82 = 2870 - 82 = 2788