Предмет: Алгебра, автор: andrivanivanovic

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Приложения:

Ответы

Автор ответа: natali198112306
0

Ответ:

1) (b+5)+15/(b-5)=(b²-25+15)/(b-5)=(b²-10)/(b-5)

2)(b²-10)/(b-5)×(b-5)²/(b²-10)=b-5

b=-2 1/18

-2 1/18-5=(-37-90)/18=-127/18=-7 1/18

Объяснение:

Автор ответа: MagdaSinger
1

Ответ:

((b+5)+ \dfrac{ 15  }{ b-5  }  ) \div   \dfrac{ b  ^ { 2  }  -10  }{ 25-10b+b  ^ { 2  }    }   =\\\\\dfrac{(b+5)(b-5)+15}{b-5} \div   \dfrac{ b  ^ { 2  }  -10  }{ 25-10b+b  ^ { 2  }    }   =\\\\ \dfrac{b^2 -5b+5b-25+15}{b-5} \div   \dfrac{ b  ^ { 2  }  -10  }{ 25-10b+b  ^ { 2  }    }  =\\\dfrac{(-10+b ^2)(25-10b+b ^2 )}{(b-5)(b ^2-10)}=\dfrac{b ^2-10b+25 }{(b-5)}=\\\dfrac{(b-5)^2}{(b-5)} =b-5\\ -2 \dfrac{ 1  }{ 18  }  -5 =-\dfrac{37}{18} -\dfrac{90}{18}=-\dfrac{127}{18}=-7\dfrac{1}{18}

Объяснение:

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6. The day before yesterday he (to finish) his work at seven o'clock.

7. What he (to do) ten years ago? – He (to study) at school.

8. Yesterday I (to ask) my friend not to ring me.

9. My father (to write) a very interesting article last month.

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5. What time they (to have) dinner yesterday? – They (to have) dinner from seven till eight.

6. When she (to see) him a year ago she (not to recognize) him.

7. I (to be) very busy yesterday. I (to prepare) for my exam the whole day.

8. My brother (to wash) the dishes while I (to sweep) the floor.

9. Why you (not to see) a doctor yesterday?

10. It (to rain) heavily when he (to go) out.
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