\(a,A=2x^2+x-\dfrac{1}{2}x^2+5x\)
\(=\left(2x^2-\dfrac{1}{2}x^2\right)+\left(x+5x\right)\)
\(=\dfrac{3}{2}x^2+6x\)
\(b,B=5xy+\dfrac{1}{2}x^2y-\dfrac{2}{3}xy+2x^2y\)
\(=\left(5xy-\dfrac{2}{3}xy\right)+\left(\dfrac{1}{2}x^2y+2x^2y\right)\)
\(=\dfrac{13}{3}xy+\dfrac{5}{2}x^2y\)
\(c,C=2x^3-2xy+x^2+5xy-x^2-\dfrac{1}{2}x^3\)
\(=\left(2x^3-\dfrac{1}{2}x^3\right)+\left(x^2-x^2\right)+\left(-2xy+5xy\right)\)
\(=\dfrac{3}{2}x^3+3xy\)
#Toru
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