245+315-28•15 (1237+108-126)•61

Question

245+315-28•15
(1237+108-126)•61

Answer 1

1. 245+315-28*15 = 140
 1)28*15=420  2)245+315=560

Comments

3)560-420=140

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Вот

Answer 2

1)140;  2)74 359. Вот и все)