a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
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a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
原式=a²+ab-(0.5a²-0.5ab-0.5b²-0.5ab+0.5b²)
=a²+ab-(0.5a²-ab)
=a²+ab-0.5a²+ab
=0.5a²+2ab
a(a+b)-[0.5a*a-0.5(a+b)b-0.5b(a-b)]
=a²＋ab-0.5(a²-ab-b²-ab+b²)
=a²＋ab-0.5×a²+ab
=0.5a²＋2ab