Предмет: Математика, автор: Vovan1741

все формулы квадратов

Ответы

Автор ответа: babimuun
0
Квадрат суммы двух величин равен квадрату первой плюс удвоенное произведение первой на вторую плюс квадрат второй. (a+b)2=a2+2ab+b2Квадрат разности двух величин равен квадрату первой минус удвоенное произведение первой на вторую плюс квадрат второй. (a-b)2=a2-2ab+b2Произведение суммы двух величин на их разность равно разности их квадратов. (a+b)(a-b)=a2-b2Куб суммы двух величин равен кубу первой плюс утроенное произведение квадрата первой на вторую плюс утроенное произведение первой на квадрат второй плюс куб второй. (a+b)3=a3+3a2b+3ab2+b3 Куб разности двух величин равен кубу первой минус утроенное произведение квадрата первой на вторую плюс утроенное произведение первой на квадрат второй минус куб второй. (a-b)3=a3-3a2b+3ab2-b3Произведение суммы двух величин на неполный квадрат разности равно сумме их кубов. ( a+b)(a2-ab+b2)=a3+b3 Произведение разности двух величин на неполный квадрат суммы равно разности их кубов. (a-b)(a2+ab+b2)=a3- b3
Похожие вопросы
Предмет: Английский язык, автор: sovcukn

Hi Imre,
Today is my last day at school. In two months’ time I’ll be starting university in Leeds. I’m going to find somewhere to live next month, hopefully near the university, although I don’t mind being near the centre. I’m not keen on places near the sports stadium – it’s very noisy! Will anyone want to share a flat with me? There are lots of adverts for flatmates on the university website. I’ve written to a few but I haven’t had any replies yet.
I’ve promised myself a new ‘look’ for my new life. Most of my clothes were bought in the sales, so they aren’t very fashionable. I’m going to study media, and I’ll be taught by some famous journalists, so I want to look modern and stylish. I’m going to wear lipstick and nail varnish, and I’m going to change my hair. It’ll be dyed red, or maybe black! I can’t stand being blonde anymore. I might even get a tattoo – I’m not sure. I like some of Lady Gaga’s tattoos, but I don’t know who they were designed by.
Most people won’t know me at university, so this is a great time to be different. Rosa is going to be on my course, and she also wants a new style. She wants me to call her ‘Roz’, too, which might feel strange. Luckily, I like my name!
When are you starting university?
Love from Helen.

•1)Read Helen’s email about starting university.What is she mainly concerned about?
a_her image and her accommodation;
b_her accommodation and her studies;
c_her friends and her image.

•Read Helen’s email again and choose the correct answers.

2)Helen would prefer to live close to the ... .
__a)university;      __b)town centre;     __c)stadium.

3)Helen visited the university website because... .
__a)she wants to find recommendations for flats;
__b)she wants to find someone to share a flat;
__c)she wanted to reply to her emails.

4)At university, Helen is definitely going to... .
__a)have fair hair;      
__b)have a tattoo;
__c)wear make-up.

5)Rosa and Helen... .
__a)are going to start university together;
__b)want to change their appearance and names;
__c)didn’t know each other before university.
 
Предмет: Математика, автор: Egorca007