Question

ajutatima am nervous pina deseara dau 25 puncte

Answer 1

Răspuns:

Explicație pas cu pas:

0,3x - 2/5 = 1,2

0,3x = 2/5 + 1.2 = 0,4 + 1,2 = 1,6

x = 1,6/0,3 = 16/10 : 3/10 = 16/3

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5x/7 - 3/5 = 1,2 - 0,4x

5x/7 + 4x/10 = 3/5 + 1,2

5x/7 + 2x/5 = 3/5 + 12/10

25x/35 + 14x/35 = 6/10 + 12/10

39x/35 = 18/10

x = 18/10 : 39/35 = 18/10 * 35/39 = 21/13

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At cub = 48 cm^2

A fetei cubului = 48 : 6 = 8 cm^2

A = L^2

L = √A = √8 = 2√2 cm

V = L^3 = (2√2)^3 = 16√2 cm^3

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2,5x - 2/3 = 3,5 - 0,5x

2,5x + 0,5x = 3,5 + 2/3

3x = 35/10 + 2/3 = 7/2 + 2/3 = 21/6 + 4/6 = 25/6

x = 25/6 : 3 = 25/18

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200*x/100 = 220

x = 220*100/200 = 110

% = 10%

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Pentru restul, daca mai ai nevoie, reposteaza.