x²y-3xy²+2yx²-y²x(列算式)

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x²y-3xy²+2yx²-y²x(列算式)

x²y-3xy²+2yx²-y²x(列算式)
x²y-3xy²+2yx²-y²x(列算式)

x²y-3xy²+2yx²-y²x(列算式)
x²y-3xy²+2yx²-y²x
=(1+2)x²y-(3+1)xy²
=3x²y-4xy²

x²y-3xy²+2yx²-y²x
=(x²y+2x²y)+(-3xy²-xy²)
=3x²y+(-4xy²)
=3x²y-4xy²