Mathematics
Senior High
Solved
なぜ0以上とわかるのですか
a, が次の条件を満たすとき, 2-5 の値を求めよ。
a=1, 6=4, a.b=2
|2a-b|²=(2a—b)·(2a-b)
=4|a|2-4a⋅ b + |62
=4×12-4×2+42=12
250であるから
|2a-b|= √12=2√3
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