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Lera1614
@Lera1614
September 2021
2
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Упростите выражения 2(7a - 5b) -7 (2a-b)
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MarketTarsier95
Verified answer
2(7а-5b)-7(2a-b)
14a-10b-14a+7b
14a-14a-10b+7b=-3b
2 votes
Thanks 6
Эльвира5102
Verified answer
2(7a - 5b) -7 (2a-b)=2*7а+2*(-5b)-7*(2а)-7*(-b)=14a-10b-14a+7b=14a-14a-10b+7b=-3b
2 votes
Thanks 2
MarketTarsier95
откуда + в конце. Был -, а потом стал +.
MarketTarsier95
сори, всё норм
Эльвира5102
минус на минус даёт плюс(знать надо)
MarketTarsier95
да я понял уде
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Answers & Comments
Verified answer
2(7а-5b)-7(2a-b)14a-10b-14a+7b
14a-14a-10b+7b=-3b
Verified answer
2(7a - 5b) -7 (2a-b)=2*7а+2*(-5b)-7*(2а)-7*(-b)=14a-10b-14a+7b=14a-14a-10b+7b=-3b