化简(1/2x²y+1/5xy²-1/4xy).(-1/2xy²)
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原式=1/2x²y▪(-1/2xy²)+1/5xy²▪(-1/2xy²)-1/4xy▪(-1/2xy²)
=1/2×(-1/2)▪(x²▪x)▪(y▪y²)+1/5×(-1/2)▪(x▪x)▪(y²▪y²)-1/4×(-1/2)▪(x▪x)▪(y▪y²)
=-1/4x³y³-1/10x²y^4+1/8x²y³
=1/2×(-1/2)▪(x²▪x)▪(y▪y²)+1/5×(-1/2)▪(x▪x)▪(y²▪y²)-1/4×(-1/2)▪(x▪x)▪(y▪y²)
=-1/4x³y³-1/10x²y^4+1/8x²y³
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