Question

упростите выражения 1)-2,4m*(-3). 2)-8a-12b+5a+17b. 3)a(a+5)+(-7+a).
4)-5(y-4)+(y+5)
СРОЧНО

Answer 1

1)-2,4m*(-3)=7.2m;

2)-8a-12b+5a+17b=-3a+5b;

3)a(a+5)+(-7+a)=a²+5a-7+a=a²+6a-7;

4)-5(y-4)+(y+5)=-5y+20+y+5=-4y+25.