Question

Calculeaza in doua moduri sau aplica propietatile inmultirii:2×3+2×5=?;10×7+10×9=?;25×100+36×100=?;42×3-32×3=?;161×5-93×5=?;7×243-7×145=?

Answer 1

2×3+2×5=6+10=16
2×(3+5)=2×8=16
10×7+10×9=70+90=160
10×(7+9)=10×16=160
25×100+36×100=2500+3600=6100
100×(25+36)=100×61=6100
42×3-32×3=126-86=30
3×(42-32)=3×10=30
161×5-93×5=805-465=340
5×(161-93)=5×68=340
7×243-7×145=1701-1015=686
7×(243-145)=7×98=686