Va rog imi puteti raspunde si mie la toate intrebarile?

Răspuns:

Explicație pas cu pas:

1.

32 : 8 - 4 = 4 - 4 = 0

2.

A = L x l = 9 cm  x 6 cm = 54 cm^2

3.

x + 2 = 5

x = 5 - 2

x = 3

4.

C^2 = 5^2 - 3^2 = 25 - 9 = 16

C = √16 = 4 cm

5.

Ma = (12 + 18) : 2 = 30 : 2 = 15

6.

P = 4 x L = 4 x 5 cm = 20 cm

7.

(a + b)^2 = a^2 + 2a*b + b^2

8.

1/5 + 2/5 = 3/5

1) 32 : 8 - 4 = 4 - 4 = 0.

2) A dreptunghi = L × l = 9 cm × 6 cm = 54 cm^2

3) × + 2 = 5

-> × = 5 - 2 = 3 => x = 3.

4) Teorema lui Pitagora => Cateta2 ^2 = Ipotenuza^2 - Cateta1 ^2 => C2 ^2 = 5^2 - 3^2 = (5+3)(5-3) = 8×2 = 16cm.

5) (12+18)/2 = 30/2 = 15.

6) patrat cu l = 5 cm. P patrat = 4 × l = 20 cm.

7) (a + b)^2 = a^2 + 2×a×b + b^2.

8) 1/5 + 2/5 = 3/5 = 6/10 = 0,6.

9)

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~ succes la examen ~