已知X-Y=3,求X-Y的2次幂减3X+3Y+1

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已知X-Y=3,求X-Y的2次幂减3X+3Y+1
已知X-Y=3,求X-Y的2次幂减3X+3Y+1

已知X-Y=3,求X-Y的2次幂减3X+3Y+1
原式=(x-y)²-3(x-y)+1
=3²-3×3+1 x-y用3代替
=1

X-Y=3
(X-Y)²-3X+3Y+1
=(X-Y)²-3(X-Y)+1
=3²-3×3+1
=1

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