Упростите выражения 5a-4b+6a+3b 7(5-y)+3(y×7) 4(3а-с)×3(5a-2c) 4+x×(4x-3)

Question

Упростите выражения
5a-4b+6a+3b
7(5-y)+3(y×7)
4(3а-с)×3(5a-2c)
4+x×(4x-3)

Answer 1

1) 11a-b
2) 35-7y+3y+21 = 56-4y
3) (12a-4c)*(15a-6c) = 180a²-16ac-72ac+24c² = 180a²-88ac+24c²
4) 4+4x²-3x

Answer 2

11a-1b=11a-b
35-7y+3y+21=56-4y
(12a-4c)*(15a-6c)=180a^2-72ac-60ac+24c^2=180a^2-132ac+24c^2
4+4x^2-3x=4x^2-3x+4