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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√

=√9×2ー√2×4ー3√

=3√ー2√ー3√

=ー2√

答え ー2√2

?,√12ー2√75+√48

=√4×3ー2√25×3+√16×3

=2√ー2×5√+4√

=2√ー10√+4√

=ー4√

答え ー4√3

?,2√45+√5ー√500

=2√5×9+√5ー√5×100

=2×3√+√5ー10√5

=6√+√5ー10√

=ー3√5

答え ー3√5

?,3√+√/√ー2√8

=3√+√×√/√×√ー2√2×4

=3√+√18/3ー2×2√

=3√+√2×9/3ー4√

=3√+3√/3ー4√

=3√+√ー4√

=0

答え 0

?,√18/3ー4√+4√10/√20

=√2×9/3ー4√+4√10×√20/√20×√20

=3√/3ー4√+4√200/20

=√ー4√+4√2×100/20

=√ー4√+4×10√/20

=√ー4√+40√/20

=√ー4√+2√

=ー√

答え ー√2

?,√18/3ー6/√8ー2√ー√1/2

=√2×9/3ー6√/√8×√8ー2√ー√×√/√×√

=3√/3ー6√×4/8ー2√2ー√/2

=√ー6×2√/8ー2√ー√/2

=√ー12√/8ー2√ー√/2

=√ー3√/2ー2√ー√/2

=2√/2ー3√/2ー4√/2ー√/2

=ー6√/2

=ー3√

答え ー3√2

?,5√×√24ー8/√

=5√×√4×6ー8√/√×√

=5√×2√ー8√/2

=5×2√3×6ー4√

=10√18ー4√

=10√2×9ー4√

=10×3√ー4√

=30√ー4√

=26√

答え 26√2

?,6√×4/√ー2√24

=6√×4√/√×√ー2√4×6

=6√×4√/3ー2×2√6

=6×4√×√/3ー4√6

=24√/3ー4√6

=8√ー4√

=4√

答え 4√6

?,1/√18ー1/√÷√12

=1×√18/√18×√18ー1×√/√×√6×1/√12

=√18/18ー√/6×1×√12/√12×√12

=√2×9/18ー√/6×√12/12

=3√/18ー√/6×√3×4/12

=√/6ー√6/6×2√/12

=√/6ー√/6×√/6

=√/6ー√×√/6×6

=√/6ー√18/36

=√/6ー√2×9/36

=√/6ー3√/36

=√/6ー√/12

=2√/12ー√/12

=√/12

答え √2/12

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