4x³y²-2x⁴y²-½xy)÷(-1/2xy)
1/2xy(8x²y-4x³y-1)÷(-1/2xy)
=-(8x²y-4x³y-1)
=8x²y-4x³y+1 (a+b)³÷[2﹙a+b)²·3(a+b)] =(a+b)³÷6[﹙a+b)³]=1/6
4x³y²-2x⁴y²-½xy)÷(-1/2xy)
1/2xy(8x²y-4x³y-1)÷(-1/2xy)
=-(8x²y-4x³y-1)
=8x²y-4x³y+1 (a+b)³÷[2﹙a+b)²·3(a+b)] =(a+b)³÷6[﹙a+b)³]=1/6