Question

2/3 - ułamek
^2 - potęga
@ - pierwiastek

Zad. 1
Wzory skróconego mnożenia.
(a+3b)^2=
(2x+3y)^2=
(5x-2y)^2=
(2/3a-4/5y)^2=
(1/3a-4/5y)^2=
(1/3a-6b)(1/3a+6b)=
(5x+y)(5x-y)=
(x-4y)(4y+x)=
([email protected][email protected])^2=
([email protected][email protected])([email protected]@7)=

Zad. 2
Układy równań.

7x-3y=15
5x+6y=27

4(x+2)=1-5y
3(y+2)=3+2x

Answer 1

(a+3b)^2=  a^2+6ab+9b^2
(2x+3y)^2=4x^2+12xy+9y^2
(5x-2y)^2=25x^2-20xy+4y

(5x+y)(5x-y)=25x^2+5xy+5xy-y^2 = 25x^2-y^2
(x-4y)(4y+x)=4yx+x^2=16y^2-4yx=x^2-16y^2

 

 

7x-3y=15/*2
5x+6y=27

 

14x-6y=30
5x+6y=27

 

19x=27

x=3

 

15+6y=27

6y=12

y=2

 

 

Tyle co potrafiłam to zrobiłam :D!