Question

помогите решить 1 задание

Answer 1

78 * 2 = (70 + 8) * 2 = 70 * 2 + 8 * 2 = 140 + 16 = 156 
316 * 3 = (300 + 10 + 6) * 3 = 300 * 3 + 10 * 3 + 6 * 3 = 900 + 30 + 18 = 948
185 * 5 = (100 + 80 + 5) * 5 = 100 * 5 + 80 * 5 + 5 * 5 = 500 + 400 + 25 = 925 

Answer 2

78×2=(70+8)×2=70×2+8×2=840+16=156 316×3=(300+10+6)×3=300×3+10×3+6×3=900+30+18=948