Question

Вычисли удобном способом: 24+17+33=74;15+43+12+7=76; 28+16+32=70; (7•2)•5=? 2•(5•9)=? (4•4)•5=?

Answer 1

24+(17+33)=24+50=74
(43+7)+(15+12)=50+27=77
(28+32)+16=60+16=76
(2*5)*7=10*7=70
(2*5)9=10*9=90
(4*5)*4=20*4=80