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