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原式=[a²+4ab+4b²-(3a²-ab+3ab-b²)-5b²]÷2b
=(a²+4ab-b²-3a²-2ab+b²)÷2b
=(2ab-2a²)÷2b
=a - a²/b
=(-1/2) - (-1/2)²/2
=-1/2 - 1/8=-5/8
=(a²+4ab-b²-3a²-2ab+b²)÷2b
=(2ab-2a²)÷2b
=a - a²/b
=(-1/2) - (-1/2)²/2
=-1/2 - 1/8=-5/8
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