(-5xy)²·(-xy)³+(4x²y-3x)(-x³·y^4)+x^5·y^5
= 25x²y²·(-x³y³)-4x^5y^5+3x^4y^4+x^5·y^5
=-25x^5y^5-4x^5y^5+x^5·y^5+3x^4y^4
=-28x^5y^5+3x^4y^4
(x^5y^5表示x的五次方y的五次方;x^4y^4表示x的四次方y的四次方)
(-5xy)²·(-xy)³+(4x²y-3x)(-x³·y^4)+x^5·y^5
= 25x²y²·(-x³y³)-4x^5y^5+3x^4y^4+x^5·y^5
=-25x^5y^5-4x^5y^5+x^5·y^5+3x^4y^4
=-28x^5y^5+3x^4y^4
(x^5y^5表示x的五次方y的五次方;x^4y^4表示x的四次方y的四次方)