Question

вычислите рациональным способом 12×(5×7) (29×2)×5 (9×4)×25 (17×4)×10 15×(4×9) 10×(29×2)

Answer 1

12×(5×7)=(12*5)*7=60*7=420

(29×2)×5=29*(2*5)=29*10=290

(9×4)×25=9*(4*25) =9*100=900

(17×4)×10=68*10=680

15×(4×9)=(15*4)*9=60*9=540

10×(29×2)=10*58=580