Question

34 БАЛЛА !!! СРОЧНО !!!
1) m^2+10m9-m^2 - 4m-99-m^2
2) 5x-3y8z + 3x-13y8z
3) 3y+74-y + y+15y-4
4) (2a-3)^29a-27 + ( a-6)^227-9a
5) 25-3x(x-5)^2 - 7x-x^2(5-x)^2

Answer 1

1)m^2+10m9-m^2 - 4m-99-m^2= 9m^2-m^4+10m+4m+99-m^2=9m^2-m^4+14m+99-m^2

2)5x-3y8z + 3x-13y8z=40xz-3y-3x+13y8z = 40xz-10y-3x8z

3)3y+74-y + y+15y-4= 12y-3y^2+7+y+154-y= 13y-3y^2+224-y

4)(2a-3)^29a-27 + ( a-6)^227-9a= 4a^2-12a+9+a^2+12a-369a-27=5a^2-279a-27

5) 25-3x(x-5)^2 - 7x-x^2(5-x)^2= 25-3x-7x+x^2(5-x^2)= 25-10x+x^2(5-x^2)= (5-x^2)(5-x^2)= 1