Предмет: Математика, автор: famamedova2006

упростите выражение а+а^2-а^3-1/а^2-1​

Ответы

Автор ответа: 1christopher
0

Пошаговое объяснение:

 \frac{a + a {}^{2}  - a {}^{3}  - 1}{a {}^{2}  - 1}  =\frac{\left(a-1\right)\left(a+1\right)\left(-a+1\right)}{\left(a-1\right)\left(a+1\right)} =\frac{-\left(a-1\right)\left(a-1\right)\left(a+1\right)}{\left(a-1\right)\left(a+1\right)} =-\left(a-1\right) =-a+1

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John: Hello.
Mum: Hi, John. Is everything OK?
John: Of course it is, mum.
Mum: What are you……………… (do)?
John: I …………………………… (watch) TV.
Mum: I can hear people.
John: That´s Tom and Sarah. We ………………………… (watch) a video.
Mum: They ………………………… (not watch) a video. They ……………………… (talk).
John: We ……………………… (have) a pizza at the moment.
Mum: ………… you …………………… (have) a party?
John: No, mum.
Mum: And your brother? What ……… he ………………… (do) ?
John: He is in his bedroom.
Mum: ………… he …………………… (study)?
John: I think so. What ………… you ………………… (do)?
Mum: We are in the car. We …………………………… (come) home.
John: Today?!
Mum: See you in about two hours…
___________________________________________________________

Linda: Hello?
Greg: Hi, Linda. It’s Greg.
Linda: Hi Greg. How are you?
Greg: I’m bored. What …………………………… (you / do)? …………………………… (you / study) for the French exam?
Linda: No, I’m not. I ……………………………… (write) some e-mails and I ………………………… (listen) to some CDs.
Greg: What ……………………………………… (you / listen) to?
Linda: The new Madonna album. It’s pretty good. What ………………………………… (you / do) ?
Greg: Well, I …………………………………… (not study) for the French exam. I ……………………………………… (watch) TV…

___________________________________________________

Dad: Hi Chris, it’s dad. What ………………………… (you / do) ?
Chris: Hi dad. I …………………………… (finish) my homework.
Dad: I can hear the TV. …………………………………… (you / watch) TV?
Chris: No, I’m not. I ……………………………… (listen) to the radio.
Dad: What …………………………………………… (Amy and Lizzie / do)?
Chris: They …………………………………… (play) on the computer.
Dad: Where’s mum?
Chris: She’s at the supermarket. She ………………………………… (buy) some food.
Dad: OK. See you later. Bye.