Question

Упростите выражение (a-2)-(a-1)(a+3)

Answer 1

(a-2)-(a-1)(a+3)=(a-2)-(a²+2a-3)=a-2-a²-2a+3=-a²-a+1

Answer 2

Решите уравнение 6(2-5x)=9-7(4x-3)

Answer 3

12-30x=9-28x+21,-2x=18,x=-9

Answer 4

(a-2)-(a2+3a-a-3)= a-2-a2-3a+a+3= a-a2+1 (a2- a во второй степени)