a) 4(6 + 7x) - 3(4x - 5= 24 + 28x - 12x + 1= 28x - 12x + 24 + 1= 16x + 39
б) 1.7(a - 4) + 0.6(6 - 2a= 1.7a - 6.8 + 3.6 - 1.2= 1.7a - 1.2a - 6.8 + 3.= 0.5a - 3.2
a) 4(6 + 7x) - 3(4x - 5
= 24 + 28x - 12x + 1
= 28x - 12x + 24 + 1
= 16x + 39
б) 1.7(a - 4) + 0.6(6 - 2a
= 1.7a - 6.8 + 3.6 - 1.2
= 1.7a - 1.2a - 6.8 + 3.
= 0.5a - 3.2