Question

Дорешайте как в тетраде

Answer 1

$7 times 65 + 7 times 35 + 3 times 35 + 3 times 55 = \ = 7 times (65 + 35) + 3 times (35 + 55) = \ = 7 times 100 + 3 times 90 = 700 + 270 = 970$

Answer 2

= 7*100+3*90=700+270 = 970