№1 .Найти ошибку: 1.( х-у)2 =х2-2ху - у2 ;2.( х-у)2 =х2-ху + у2; 3.( х-у)2 =х-2ху + у ;4. ( х-у)2 =х2+2ху - у2;5.( х-у)2 =х2-2ху + у.. Created by tema007kosta. algebra-ru

№1 .Найти ошибку: 1.( х-у)2 =х2-2ху - у2 ;2.( х-у)2 =х2-ху + у2; 3.( х-у)2 =х-2х...

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№1 .Найти ошибку:

1.( х-у)2 =х2-2ху - у2 ;

2.( х-у)2 =х2-ху + у2;

3.( х-у)2 =х-2ху + у ;

4. ( х-у)2 =х2+2ху - у2;

5.( х-у)2 =х2-2ху + у.

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NNNLLL54

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Ответ:

1) Ошибки в 1,2,3,4 . Верно в 5 примере.

2) Верно 1 и 4 .

$x^2-2xy+y^2=(x-y)^2\ \ ,\ \ \ \ p^2-2pb+b^2=(p-b)^2$

$3)\ \ x^2-15x+56=0\ \ ,\ \ D=1\ ,\ x_1=8\ ,\ x_2=7\\\\x^2+10x+21=0\ \ ,\ \ D=16\ \ ,\ \ x_1=-7\ ,\ \ x_2=-3$

$4)\ \ bc^2\cdot (-0,5b^2)\cdot (-8c)=bc^2\cdot 0,25b^2\cdot 8c=\underline {\ 2}\, b^3\, c^3\\\\(-3xy^3)^2=9\, x^2y^6\\\\3b(2b+3)=6b^2+9b\\\\2x-3y+3x+2y=5x-y\\\\(x-1)(x+3)=x^2+2x-3\\\\(10a^2b+5ab^2):5ab=\dfrac{10a^2b}{5ab}+\dfrac{5ab^2}{5ab}=2a+b$

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