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\(\sqrt{16}-\sqrt{9}+\sqrt{16+9}-\sqrt{\left(-2\right)^2}\)
\(=4-3+5-2=4\)
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\(\left(\sqrt{1\frac{9}{16}}-\sqrt{\frac{9}{16}}\right)\)
\(=\left(\sqrt{\frac{25}{16}}-\sqrt{\frac{9}{16}}\right)\)
\(=\left(\sqrt{\left(\frac{5}{4}\right)^2}-\sqrt{\left(\frac{3}{4}\right)^2}\right)\)
\(=\left(\frac{5}{4}-\frac{3}{4}\right)=\frac{5-3}{4}=\frac{2}{4}=\frac{1}{2}\)
...Vậy ...................
\(\sqrt{1\frac{9}{16}}-\sqrt{\frac{9}{16}}=\sqrt{\frac{25}{16}}-\sqrt{\frac{9}{16}}\)
\(=\sqrt{\left(\frac{5}{4}\right)^2}-\sqrt{\left(\frac{3}{4}\right)^2}=\frac{5}{4}-\frac{3}{4}=\frac{2}{4}=\frac{1}{2}\)
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\(=\left(\dfrac{3}{2}-3\right).\sqrt{\dfrac{25}{16}}=\left(-\dfrac{3}{2}\right).\dfrac{5}{4}=-\dfrac{15}{8}\)
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\(\sqrt{4}\) + \(\sqrt{9}\) + \(\sqrt{16}\) + \(\sqrt{25}\)
= 2 + 3 + 4 + 5
= 5 + 4 + 5
= 9 + 5 = 14
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\(5\sqrt{16}-4\sqrt{9}+\sqrt{25}-\sqrt{400}\)
\(=5.4-4.3+5-20\)
\(=20-12+5-20\)
\(=-7\)
5√16−4√9+√25−√400
=5.4−4.3+5−20
=20−12+5−20
=8+5-20
=13-20
=-7
căn (16+9)=5
và căn 16+ căn 9=4+3=7