-+18=6·(10+8)=16°·10)+16·81=748 0 5 18·5=5·(18+8)=15·10)+18·81=90 3 24·4=4·(120+4)=148·20)+(4·4)=700 28·5=5·(120+8)=(5·20)+(8·5)=740 4·12=4·(10+2)=(4·10)+(4·2)=48 16· 4=4·(70+6)=(4·10)+(4·6)=64 36·3=3·(130+6)=(3·30)+(18·6)=96 6

Примеры:

• $$18 = 6 \cdot (10+8) = (6 \cdot 10) + (6 \cdot 8) = 60 + 48 = 108$$
• $$18 \cdot 5 = 5 \cdot (10+8) = (5 \cdot 10) + (5 \cdot 8) = 50 + 40 = 90$$
• $$24 \cdot 4 = 4 \cdot (20+4) = (4 \cdot 20) + (4 \cdot 4) = 80 + 16 = 96$$
• $$28 \cdot 5 = 5 \cdot (20+8) = (5 \cdot 20) + (5 \cdot 8) = 100 + 40 = 140$$
• $$4 \cdot 12 = 4 \cdot (10+2) = (4 \cdot 10) + (4 \cdot 2) = 40 + 8 = 48$$
• $$16 \cdot 4 = 4 \cdot (10+6) = (4 \cdot 10) + (4 \cdot 6) = 40 + 24 = 64$$
• $$36 \cdot 3 = 3 \cdot (30+6) = (3 \cdot 30) + (3 \cdot 6) = 90 + 18 = 108$$

Ответ: смотри решение выше.