✨ Best Answer ✨
A＝7a＋5
B＝7b＋6とおく。
AB＝(7a＋5)(7b＋6)
＝7a×7b＋7a×6＋7b×5＋5×6
＝7×7ab＋7×6a＋7×5b＋30
＝7(7ab＋6a＋5b)＋30
＝7(7ab＋6a＋5b)＋7×4＋2
＝7(7ab＋6a＋5b＋4)＋2
よって、余りは2
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