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ivanjer1exz
@ivanjer1exz
July 2022
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вычислить значение дроби (4a+9b)/(5a-b), если 3a+5b=0
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zhenyaM2002
Verified answer
3а+5b=0
5b = -3a
b= -3a/5
Подставим в дробь:
(4a+ 9 * (-3a/5 ) ) / (5a - (-3a/5) ) =
= (4a - 27a/5 ) / (5a + 3a/5) =
= ((20a -27a) /5 ) / ( (25a+3a)/5) =
= -7a/5 : 28а/5 =
= -7а/5 * 5/28а=
= -7а/28а = - 7/28 = - 1/4=-0,25
2 votes
Thanks 3
dmitrij330
Жека, ты как всегда - крусаучег))
zhenyaM2002
:-)
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Answers & Comments
Verified answer
3а+5b=05b = -3a
b= -3a/5
Подставим в дробь:
(4a+ 9 * (-3a/5 ) ) / (5a - (-3a/5) ) =
= (4a - 27a/5 ) / (5a + 3a/5) =
= ((20a -27a) /5 ) / ( (25a+3a)/5) =
= -7a/5 : 28а/5 =
= -7а/5 * 5/28а=
= -7а/28а = - 7/28 = - 1/4=-0,25