＝b²/12＋ab/6＋4a²/45
＝1/12(b²＋2ab)＋4a²/45
＝1/12{(b＋a)²－a²}＋4a²/45
＝1/12(b＋a)²－1/12a²＋4a²/45
＝1/12(b＋a)²＋a²/180
だと思います。分かりづらかったらすみません…。
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