Question

1. uprosc wyrazenie a-(-(a-1))

2.zapisz w najprostszej postaci
5y-3(y-1)=?
-3(x-7)-(x+2)
-(x+2)-3(2x-4)+2(x-1)

3.
4(2x-3y)-2(5x+?)=-2x+2y
-(3y-2x)+4(?-y)=-10x?

blagam na teraz,

Answer 1

Zadanie 1

 

a-(-(a-1)) = a-(-a+1)=a+a-1=2a-1

 

Zadanie 2

 

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

-3(x-7)-(x+2) = -3x+21-x-2 = -4x+19
-(x+2)-3(2x-4)+2(x-1) =  -x-2-6x+12+2x-2 = -5x+8

 

Zadanie 3

 

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

8x-12y-2(5x+?)=-2x+2y

10x-14y=10x+2?

?=-7y

 

-(3y-2x)+4(?-y)=-10x?

-3y+2x=-10x?+4(?-y)

 

4(?-y) = -3y 

4?-4y=-3y

4?=y

 

 

? = -5

? =  y/4

 

Answer 2

1

a-(-(a-1))=a-(-a+1)=(a+a-1=2a-1

2.

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

-3(x-7)-(x+2)=-3x+21-x-2=-4x+19

-(x+2)-3(2x-4)+2(x-1)=-x-2-6x+12+2x-2=-5x+8

 

3.

4(2x-3y)-2(5x+?)=-2x+2y
-(3y-2x)+4(?-y)=-10x?          brak polecenia i co znaczą te ?