Question

Раскройте скобки и упростите :
1) 7a -(5a+ 4b)
2) 9x - (7y - 4x )
3) -(2a - 3b )
4)8x - (3y + 5x ) - ( - 2y - x )

Answer 1

$1) 7a-5a - 4b = 2a - 4b$

$2)9x - 7y + 4x = 13x - 7y$

$3) 3b - 2a$

$4)8x - 3y - 5x + 2y + x = 4x - y$