Question

Помогите пожалуйста

Answer 1

1.

1) $(6x^{2}-7x+4)-(4x^{2}-4x+18)=6x^{2}-7x+4-4x^{2}+4x-18=2x^{2}-3x-14$

2) $(3x+9)+(-x^{2}-15x-40)=3x+9-x^{2}-15x-40=-x^{2}-12x-31$

3) $(10a^{2}-6a+5)-(-11a+a^{3}+6)=10a^{2}-6a+5+11a-a^{3}-6=-a^{3}+10a^{2}+5a-1$

2.

1) $3x(x^{2} -2x+3)=3x^{3} -6x^{2} +9x$

2) $-4a(a^{2} -3ab+7b)=-4a^{3} +12a^{2}b-28ab$

3) $0.6a^{2}b(3ab^{2}-8ab+11a^{2}b^{2})=1.8a^{3}b^{3}-4.8a^{3}b^{2}+6.6a^{4}b^{3}$