Question

AAJJUUTTOORR!!DAU COROANA!​

Answer 1

Răspuns:

2.

$\frac{x + 1}{x + 3} = \frac{4}{5} \\ \ \ 5(x + 1) = 4(x + 3) \\ 5x + 5 = 4x + 12 \\ 5x - 4x = 12 - 5 \ \\ x = 7$

Answer 2

1.a=20+20⁰=20+1=21

b=20-20⁰=20-1=19

(a+b)×(a-b)=(21+19)×(21-19)=40×2=80

2.

$\frac{x + 1}{x + 3 } = \frac{4}{5}$

5(x+1)=4(x+3)

5x×5=4x+12

x=12-5

x=7

3.

$\frac{1}{4} = \frac{3}{12}$

Acestea sunt echivalente deoarece:

-ambele reprezinta un sfert din total;

-putem simplifica 3/12 prin 3 si ne da 1/4

Sper ca te-am ajutat!