Question

ДАЮ 45 БАЛЛОВ
За решение
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Answer 1

1.
а) 4 - 2а - 10 = -2а - 6

б) -8у - 9 - 7у = -15у - 9

в) -(4/7)b + (3/8)b = -(32/56)b + (21/56)b =
= -(11/56)b

г) -5а - 7b +4b - 9a = -14a - 3b

д) -(5/9)х - (1/2)у - (1/6)х + (2/3)у =
= -(10/18)х - (3/18)х - (3/6)/у + (4/6)у =
= -(13/18)х +(1/6)у

2.
а) 17 - ( -b + 17) = 17 + b - 17 = b

б) -4(а - 2) + 7 = -4а + 8 + 7 = -4а + 15

в) 5(10 - х) - 3(8 - х) = 50 - 5х - 24 + 3х =
= 26 - 2х

г) (3/4) •((2а - (3 1/5)b) - 1,2•((5/6)a - (2/3)b)) =
= (3/4)•((2а - (16/5)b) - (12/10)•((5/6)a - (2/3)b)) =
= (3/4)•2a - (3/4)•(16/5)b - (12/10)•(5/6)a -
- (12/10)•(2/3)b =
= (3/2)a - (12/5)b - a - (4/5)b =
= (1 1/2)a - a - (12/5)b - (4/5)b =
= (1/2)a - (16/5)b =
= 0,5a - 3,2b