Решение:
12<span>27</span> - 6<span>35</span> = 6 + <span>27</span> - <span>35</span> = 6 - <span>2·57·5</span> - <span>3·75·7</span> = 6 + <span>1035</span> - <span>2135</span> = 6 + <span>10 - 2135</span> = 6 - <span>1135</span> = <span>6·3535</span> - <span>1135</span> = <span>19935</span> = <span>24 + 5·3535</span> = 5<span>2435</span> ≈ 5.685714285714286
(6/5 - 3/4) × 2/3=
1. 6/5 - 3/4=24/20 - 15/20=9/20
2. 9/20 × 2/3=18/60=9/30=3/10
А)1)-7•4=-28
2)-28•(-5)=-140
Б)1)-2•(-1)=-2
2)-2•(-3)=-6
3)-6•(-12)=-72