Question

pls pomóżcie na dziś​

Answer 1

zad 1

a) 7a-a       b=8

7×8-×8=56-4=52

b) 3+2b    b=-4

3×+2×(-4)=3×16-8=48-8=40

c) (2x+3y)(5-x)           x=2       y=-3

[2×2+3×(-3)]×(5-2)=(4-9)×3=(-5)×3=-15

zad 2

a=

-a= -()=

Odp. B

zad 3

a) -2a+2+8a-3a= -5a+8a+2=3a+2

b) x+2y-6x-5y-2y= -5y-5x

c) 2-3y+5x+2y-= +5x-y= x(x+5)-y

zad 4

a) 12a-(5a+3)+7(2-a)= 12a-5a-3+14-7a=11

b) 4(x-y)-3y-2(y-x)+x= 4x-4y-3y-2y+2x+x=7x-9y

zad 5

16%a=0,16a

Odp. C