Question

Спростіть вираз:
а) –(3а – 6) + 3(2 – 2а) + 15а;

б) 0,9(а – 3b) – 0,2(5b – 3a) – 1,7b;

в) 4(5n – 2(n – 1)) + 10.

Answer 1

a) -(3a - 6) + 3(2 - 2a) + 15a =

= -3a + 6 + 6 - 6a + 15a =

= 12 + 6a

b) 0,9(a - 3b) - 0,2(5b - 3a) - 1,7b =

= 0,9a - 2,7b - b + 0,6a - 1,7b =

= 1,5a - 5,4b

в) 4(5n - 2(n - 1)) + 10 =

= 4(5n - 2n + 2) + 10 =

= 4(3n + 2) + 10 =

= 12n + 8 + 10 =

= 12n + 18