Răspuns:
) 5(3x - 6) + 4(3 - 2x) = 5x - 8
15x - 30 + 12 - 8x = 5x - 8
15x - 8x - 5x = 30 - 12 - 8
2x = 10
x = 5
b) 9(x - 3 ) - 4(7 - 3x) = 5 - 3x
9x - 27 - 28 + 12x = 5 - 3x
9x + 12x + 3x = 27 + 28 + 5
24x = 60
x = 2,5
c) 2 3/8 ( 1/3 - 3x ) + 5/8 ( 1/3 - 3x ) = 1
19/8 ( 1/3 - 3x ) + 5/8 ( 1/3 - 3x ) = 1
19/24 - 57/8x + 5/24 - 15/8x = 1
-72/8x + 24/24 = 1
-9x + 1 = 1
-9x = 0
x = 0
d) 15-x / 6 - 2x+16 / 5 = 1
5(15 - x ) - 6(2x + 16 ) = 30
75 - 5x - 12x - 96 = 30
-17x = 30 - 75 + 96
-17x = 51
x = -3
Explicație pas cu pas:
