2x²/3y²×5y/6x÷10y/21x^2
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2x²/3y²×5y/6x÷10y/21x^22x²/3y²×5y/6x÷10y/21x^22x²/3y²×5y/6x÷10y/21x^22
2x²/3y²×5y/6x÷10y/21x^2
2x²/3y²×5y/6x÷10y/21x^2
2x²/3y²×5y/6x÷10y/21x^2
2x²/3y²×5y/6x÷10y/(21x²)
=2x²/(3y²)×(5y/6x)×(21x²)/(10y)
=7(x^4)y/(6xy³)
=7x³/(6y²)