Помогите СРОЧНО математику!!!

1. Найдите значение выражения:

а) (7х + 160) - 2х

(9у+15)-8у

(1267 + 139х)-39х

 

б) 25*(800- 2)

37*( 1000-1)

627*(1000 + 1)

 

2. Решите уравнение:

а) 256х -147 х -1871 = 63747

б) 888800 :110 + у = 809

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