Question

Valoarea lui x din egalitatea [1,2 + 3,2 * (3 x + 0,75)] : 3 = 3,6
este egala cu A ) 0,95 B ) 1,69 C )6,5 D ) 0,75 E ) 1,6

Answer 1

Răspuns:

[1,2+3,2(3x+0,75)]:3=3,6

1,2+3,2(3x+0,75)=3,6·3

1,2+9,6x+2,4=10,8

9,6x=10,8-3,6

x=7,2:9,6

x=0,75

raspuns D

Answer 2

[ 1, 2 + 3, 2 × ( 3 x + 0, 75 ) ] : 3 = 3, 6

1, 2 + 3, 2 × ( 3 x + 0, 75 ) = 3, 6 × 3

1, 2 + 3, 2 × ( 3 x + 0, 75 ) = 10, 8

3, 2 × ( 3 x + 0, 75 ) = 10, 8 - 1, 2

3, 2 × ( 3 x + 0, 75 ) = 9, 6

3 x + 0, 75 = 9, 6 : 3, 2

3 x + 0, 75 = 3

3 x = 3 - 0, 75

3 x = 2, 25

x = 2, 25 : 3

x = 0, 75