3.1. Simplify the following algebraic expressions -5xy^2 (6xy^2 - 5xy^2 + 6x)?
−5xy2(6xy2−5xy2+6x)-5xy^2(6xy^2-5xy^2+6x)−5xy2(6xy2−5xy2+6x)
=−5xy2×6xy2−5xy2×(−5xy2)+(−5xy2)×6x=-5xy^2\times6xy^2-5xy^2\times(-5xy^2)+(-5xy^2)\times6x=−5xy2×6xy2−5xy2×(−5xy2)+(−5xy2)×6x
=−30x1+1y2+2+25x1+1y2+2−30x1+1y2=-30x^{1+1}y^{2+2}+25x^{1+1}y^{2+2}-30x^{1+1}y^2=−30x1+1y2+2+25x1+1y2+2−30x1+1y2
=−30x2y4+25x2y4−30x2y2=-30x^{2}y^{4}+25x^2y^4-30x^2y^2=−30x2y4+25x2y4−30x2y2
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