a²-3ab+5-(a²+3ab+7)

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a²-3ab+5-(a²+3ab+7)a²-3ab+5-(a²+3ab+7)a²-3ab+5-(a²+3ab+7)原式=a²-3a

a²-3ab+5-(a²+3ab+7)
a²-3ab+5-(a²+3ab+7)

a²-3ab+5-(a²+3ab+7)
原式=a²-3ab+5-a²-3ab-7
=(a²-a²)-(3ab+3ab)+(5-7)
=-6ab-2