То, что сможете))))

1 3/19+7/19=10/19 5/11-7/9=45/99-77/99=-32/99 1 2/3+2 3/5=1 10/15+2 9/15=3 19/15=4 4/15 3/40+1/10=3/40+4/40=7/40 7/24-5/36=21/72-10/72=11/72 2 [latex]21x^5y^6*2y^3=42x^5y^9[/latex] [latex]3a^4b^5*6a^2b=18a^6b^6[/latex] [latex](4a^6-b)*ab=4a^7b-ab^2[/latex] [latex]2xy^3(x+y)=2x^2y^3+2xy^4[/latex] [latex]27a^3b^8:(3ab^2)=9a^2b^6[/latex] [latex](a-3b)(3b+a)=a^2-9b^2[/latex]