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中学3年数学 平方根 根号を含む式の計算 3確認問題1・解答

中学3年数学 平方根 根号を含む式の計算 3確認問題1・解答

1、次の計算をしてください。

?,√18ー√8ー3√2

=√9×2ー√2×4ー3√2

=3√2ー2√2ー3√2

=ー2√2

答え ー2√2

?,√12ー2√75+√48

=√4×3ー2√25×3+√16×3

=2√3ー2×5√3+4√3

=2√3ー10√3+4√3

=ー4√3

答え ー4√3

?,2√45+√5ー√500

=2√5×9+√5ー√5×100

=2×3√5+√5ー10√5

=6√5+√5ー10√5

=ー3√5

答え ー3√5

?,3√2+√6/√3ー2√8

=3√2+√6×√3/√3×√3ー2√2×4

=3√2+√18/3ー2×2√2

=3√2+√2×9/3ー4√2

=3√2+3√2/3ー4√2

=3√2+√2ー4√2

=0

答え 0

?,√18/3ー4√2+4√10/√20

=√2×9/3ー4√2+4√10×√20/√20×√20

=3√2/3ー4√2+4√200/20

=√2ー4√2+4√2×100/20

=√2ー4√2+4×10√2/20

=√2ー4√2+40√2/20

=√2ー4√2+2√2

=ー√2

答え ー√2

?,√18/3ー6/√8ー2√2ー√1/2

=√2×9/3ー6√8/√8×√8ー2√2ー√1×√2/√2×√2

=3√2/3ー6√2×4/8ー2√2ー√2/2

=√2ー6×2√2/8ー2√2ー√2/2

=√2ー12√2/8ー2√2ー√2/2

=√2ー3√2/2ー2√2ー√2/2

=2√2/2ー3√2/2ー4√2/2ー√2/2

=ー6√2/2

=ー3√2

答え ー3√2

?,5√3×√24ー8/√2

=5√3×√4×6ー8√2/√2×√2

=5√3×2√6ー8√2/2

=5×2√3×6ー4√2

=10√18ー4√2

=10√2×9ー4√2

=10×3√2ー4√2

=30√2ー4√2

=26√2

答え 26√2

?,6√2×4/√3ー2√24

=6√2×4√3/√3×√3ー2√4×6

=6√2×4√3/3ー2×2√6

=6×4√2×√3/3ー4√6

=24√6/3ー4√6

=8√6ー4√6

=4√6

答え 4√6

?,1/√18ー1/√6÷√12

=1×√18/√18×√18ー1×√6/√6×√6×1/√12

=√18/18ー√6/6×1×√12/√12×√12

=√2×9/18ー√6/6×√12/12

=3√2/18ー√6/6×√3×4/12

=√2/6ー√6/6×2√3/12

=√2/6ー√6/6×√3/6

=√2/6ー√6×√3/6×6

=√2/6ー√18/36

=√2/6ー√2×9/36

=√2/6ー3√2/36

=√2/6ー√2/12

=2√2/12ー√2/12

=√2/12

答え √2/12

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