Помогите (40-1)×8=40×8-1×8?

Question

Помогите
(40-1)×8=40×8-1×8?

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Answer 1

(40-1)×8=40×8-1×8=320-8=312;///59*6=60*6-1*6=360-6=354;/// 79*5=80*5-1*5=400-5=395;//7*49= 50*7-1*7=350-7=343