Упростите многочлен:
а) 2a + 5b + 7a;
б) 2x + 3y + 10x;
в) 7a + b + 3a + b;
г) a + 7b + b + 2a;
д) 2x + y + 3x + y + 4x;
е) a + 2x + 5x + 2a + 9x.
2a + 5b + 7a = 2a + 7a + 5b = 9a + 5b
2x + 3y + 10x = 2x + 10x + 3y = 12x + 3y
7a + b + 3a + b = 7a + 3a + b + b = 10a + 2b
a + 7b + b + 2a = a + 2a + 7b + b = 3a + 8b
2x + y + 3x + y + 4x = 2x + 3x + 4x + y + y = 9x + 2y
a + 2x + 5x + 2a + 9x = a + 2a + 2x + 5x + 9x = 3a + 16x