Mathematics
Junior High
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🟨以外で早く計算できるやり方はありますか?
答え1600
(2)a=79,b=21のとき, α-2ab-362 の式の値を求めなさい。
2²-sab+b²
21
×21
21
H
44
1764
2
2
(a-b)-4b²
2
(79-21)-4×21
121g
58-1764
23364
-1764
1600
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