(4.5*10^5)(2*10^3)(3*10^4)&2x^2y(-8y^2)+4x^2y*5y^2&(x+3y)(2x-y)

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(4.5*10^5)(2*10^3)(3*10^4)&2x^2y(-8y^2)+4x^2y*5y^2&(x+3y)(2x-y)

(4.5*10^5)(2*10^3)(3*10^4)&2x^2y(-8y^2)+4x^2y*5y^2&(x+3y)(2x-y)
(4.5*10^5)(2*10^3)(3*10^4)&2x^2y(-8y^2)+4x^2y*5y^2&(x+3y)(2x-y)

(4.5*10^5)(2*10^3)(3*10^4)&2x^2y(-8y^2)+4x^2y*5y^2&(x+3y)(2x-y)
(4.5*10^5)(2*10^3)(3*10^4)
=(4.5×2×3)×10^(5+3+4)
=27×10¹²
=2.7×10¹³
2x^2y(-8y^2)+4x^2y*5y^2
=-16x²y³+20x²y³
=4x²y³
(x+3y)(2x-y)
=2x²+5xy-3y²