Докажите торжество
1) 4a^2-(6a^2-2ab)+(3ab+2a^2)=5ab
2) (9x^6-4x^3)-(x^3-9)-(8x^6-5x^3)=x^6+9

1)4a^2-6a^2+2ab+3ab+2a^2=5ab

(-2a)^2+5ab+2a^2=5ab

5ab=5ab

2)9x^6-4x^3-x^3+9-8x^6+5x^3=x^6+9

x^6+9=x^6+9