Question

№ 2. Раскройте скобки и упростите: а) y – ( y – ( 2y – 4 )) б) (2a + 5b) + (8a – 11b) в) (3x + 10y) – (6x + 3y)

Answer 1

Ответ:

а) y – ( y – ( 2y – 4 ))  =  y – ( y – 2y + 4 ) = y – ( – y + 4 ) = 2y + 4

б) (2a + 5b) + (8a – 11b)  = 2a + 5b + 8a – 11b = 10a - 6b

в) (3x + 10y) – (6x + 3y) = 3x + 10y – 6x – 3y = – 3x + 7x

Пошаговое объяснение:

Answer 2

a) y – (y – (2y – 4)) = y - y + 2y - 4 (Distribute the negative sign to both terms inside the inner parentheses.) = 2y - 4 (Combine like terms.)

б) (2a + 5b) + (8a – 11b) = 2a + 5b + 8a - 11b (Distribute the addition sign to both sets of parentheses.) = (2a + 8a) + (5b - 11b) (Group like terms together.) = 10a - 6b (Combine like terms.)

в) (3x + 10y) – (6x + 3y) = 3x + 10y - 6x - 3y (Distribute the subtraction sign to both sets of parentheses.) = (3x - 6x) + (10y - 3y) (Group like terms together.) = -3x + 7y (Combine like terms.)