Răspuns:
13( 17+ 23) + 70 ( 40-27)
13× 40 + 70× 13
13( 40+70)
13× 110
= 1430
d)
13 · 17 + 13 · 23 + 70 · 40 - 70 · 27 =
= 13(17 + 23) + 70(40 - 27) =
= 13 × 40 + 70 × 13 =
= 13(40 + 70) =
=13 × 110 = 1430
