[tex]5xy^2-4xy^2+3xy^2=xy^2+3xy^2=4xy^2\\
-18x^4y^2-14x^4y^2+5x^4y^2=-27x^4y^2\\
a^2x+6a^2x-a^2x=6a^2x\\
-\frac{2}{3}x\cdot9x^2+\frac{5}{9}x^6:(\frac{20}{27}x^3)+3x^3=\\
-6x^3+\frac{5}{9}\cdot\frac{27}{20}x^3+3x^3= -^{4)} 3x^3+\frac{3}{4}x^3=-\frac{9}{4}x^3\\
1,2x^3+0,5x^3-0,25x^3=1,45x^3\\
-\frac{27}{32}x^2+16x^2-x^2=-\frac{27}{32}x^2+ ^{32)} 15x^2=\frac{453}{32}x^2
[/tex]
