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\(\sqrt{9}-\sqrt{25}-\sqrt{\frac{4}{9}}\)
\(=\sqrt{3^2}-\sqrt{5^2}-\sqrt{\left(\frac{2}{3}\right)^2}\)
\(=3-5-\frac{2}{3}\)
\(=\left(3-5\right)-\frac{2}{3}\)
\(=-2-\frac{2}{3}\)
\(=\frac{-6}{3}-\frac{2}{3}\)
\(=\frac{-6-2}{3}\)
\(=\frac{-8}{3}\)
\(\sqrt{9}-\sqrt{25}-\sqrt{\frac{4}{9}}\)
\(=\sqrt{3^2}-\sqrt{5^2}-\sqrt{\left(\frac{2}{3}\right)^2}\)
\(=3-5-\frac{2}{3}\)
\(=\left(3-5\right)-\frac{2}{3}\)
\(=-2-\frac{2}{3}\)
\(=\frac{-6}{3}-\frac{2}{3}\)
\(=\frac{-6-2}{3}\)
\(=\frac{-8}{3}\)
\(\sqrt[2]{\frac{1}{4}}-\sqrt{25}+\sqrt{\frac{4}{9}}=\frac{1}{2}-5+\frac{2}{3}=\)\(\frac{-23}{6}\)
\(\sqrt{\frac{1}{9}+\frac{1}{16}}\)
\(=\frac{1}{3}+\frac{1}{4}\)
\(=\frac{7}{12}\)
a) \(\left(\frac{2^2}{5}\right)+5\frac{1}{2}.\left(4,5-2,5\right)+\frac{2^3}{-4}\)
\(=\frac{4}{5}+\frac{11}{2}.2+\frac{-8}{4}\)
\(=\frac{4}{5}+11-2\)
\(=\frac{4}{5}+9\)
\(=\frac{49}{9}\)
b) \(\left(-2^3\right)+\frac{1}{2}:\frac{1}{8}-\sqrt{25}+\left|-64\right|\)
\(=-8+4-5+64\)
= 55
c) \(\frac{\sqrt{3^2+\sqrt{39}^2}}{\sqrt{91^2}-\sqrt{\left(-7\right)^2}}\)
\(=\frac{\sqrt{9+39}}{91-\sqrt{49}}\)
\(=\frac{\sqrt{48}}{91-7}\)
\(=\frac{4\sqrt{3}}{84}\)
\(=\frac{\sqrt{3}}{41}\)
d) Xem lại đề nhé em!
e) \(\sqrt{25}-3\sqrt{\frac{4}{9}}\)
\(=5-3.\frac{2}{3}\)
= 5 - 2
= 3
h) \(\left(-3^2\right).\frac{1}{3}-\sqrt{49}+\left(5^3\right):\sqrt{25}\)
\(=-9.\frac{1}{3}-7+125:5\)
\(=-3-7+25\)
= 15
1. a) 3+2=5
b) 0,5-0,1=0,4
c) 4/5-1/9=31/45
d) 2-0,6=1,4
2. a) 8-4+3=7
b) 11+5-3=13
c) 3/2-4/6-7-37/6
d) 4+5-6=3
giống bài nãy đó chỉ đổi dấu và KQ khác
= 3 - 5 + 2/3
= ( -2 )+ 2/3
= -4/3