Помогитеее ном 2 пжжжж

Question

Помогитеее ном 2 пжжжж

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Answer 1

1 ) 9 х 69 - 7 х 69 = 2 х 69 = 2 х ( 70 - 1 ) = 140 - 2 = 138
2 ) 498 х 3 - 498 = 3 х 498 = 1494 - 498 = 996
3 ) 10 х 68 - 68 - 9 = 1 х 68 = 1 х ( 70 - 2 ) = 70 - 2 = 68