Question

Вычислите удобным способом:
29×25+15×6+19×15
26×18+26×17+14×35

Answer 1

26×18+26×17=26× (18+17)=26×35. 26×35+14×35=35 ×(26+14)=26×40 15×6+19×15=15×(19+6)=15×25. 25×15+25×29= 25×44 26×40+25×44= 2140