a) 9
b)90
c)8
d)7/10
e)2/5

a=9

b=90

c=2

d=0,7

e=0,2

\(a,\sqrt{81}=9\)

\(b.\sqrt{8100}=90\)

\(c,\sqrt{64}=8\)

\(d,\sqrt{25}=5\)

\(e,\sqrt{0,64}=0,8\)

\(f,\sqrt{10000}=100\)

\(g,\sqrt{0,01}=0,1\)

\(h,\sqrt{\frac{49}{100}}=\frac{7}{10}\)

\(i,\sqrt{\frac{0,09}{121}}=\frac{0,3}{11}\)

\(j,\sqrt{\frac{4}{25}}=\frac{2}{5}\)

~Study well~

#JDW

a) 9

b) 90 

c) 8

d) 5

e) 0,8

f) 100

g) 0,1

h) \(\frac{7}{10}\)

i) \(\frac{0,3}{11}\)

j) 0,4.

\(\begin{array}{l}a)\sqrt {0,49}  + \sqrt {0,64}  = 0,7 + 0,8 = 1,5;\\b)\sqrt {0,36}  - \sqrt {0,81}  = 0,6 - 0,9 =  - 0,3;\\c)8.\sqrt 9  - \sqrt {64}  = 8.3 - 8 = 24 - 8 = 16;\\d)0,1.\sqrt {400}  + 0,2.\sqrt {1600}  = 0,1.20 + 0,2.40 = 2 + 8 = 10\end{array}\)

\(\sqrt{81}=9\)

\(\sqrt{0,64}=0,8\)

\(\sqrt{\frac{49}{100}}=\frac{7}{10}\)

\(\sqrt{8100}=90\)

\(\sqrt{100=}10\)

\(\sqrt{0,01}=0,1\)

\(\sqrt{\frac{4}{25}}=\frac{2}{5}\)

\(\sqrt{\frac{0,09}{121}}=\frac{0,3}{11}\)

\(\sqrt{81}=9\);\(\sqrt{0,64}=0,8\);\(\sqrt{\frac{49}{100}}=\frac{7}{10}\);\(\sqrt{8100}=90\); \(\sqrt{100}=10\); \(\sqrt{0,01}=0,1\); \(\sqrt{\frac{4}{25}}=\frac{2}{5}\); \(\sqrt{\frac{0,09}{121}}=\frac{0,3}{11}=\frac{3}{110}\)

\(\sqrt{81}=9\)

\(\sqrt{0.64}=\sqrt{\frac{64}{100}}=\frac{8}{10}\);\(\sqrt{\frac{49}{100}}=\frac{7}{10}\)

\(\sqrt{8100}=\sqrt{81}.\sqrt{100}=9.10=90\);\(\sqrt{100}=10\)

\(\sqrt{0,01}=0,1\);\(\sqrt{\frac{4}{25}}=\frac{2}{5}\);\(\sqrt{\frac{0,09}{121}}=\frac{0,3}{11}\)

a) \(\sqrt{0,09}-\sqrt{0,64}=\frac{-1}{2}=-0,5\)

b) \(0,1\cdot\sqrt{225}-\sqrt{\frac{1}{4}}=0,1\cdot15-\frac{1}{2}=1\)

c) \(\sqrt{0,36}\cdot\sqrt{\frac{25}{16}+\frac{1}{4}}=\frac{3\sqrt{29}}{20}\)

d) đề baì có sai ko ban?

a)\(\sqrt{1}\)+\(\sqrt{9}\)+\(\sqrt{25}\)+\(\sqrt{49}\)+\(\sqrt{81}\)

=1+3+5+7+9

=25

b)=\(\dfrac{1}{2}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{6}\)+\(\dfrac{1}{4}\)

=\(\dfrac{6}{12}\)+\(\dfrac{4}{12}\)+\(\dfrac{2}{12}\)+\(\dfrac{3}{12}\)

=\(\dfrac{15}{12}\)

c) =0,2+0.3+0,4

= 0.9

d) =9-8+7

=8

j) =1,2-1,3+1.4

= (-0,1)+1,4

=1,4

g) \(\dfrac{2}{5}\)+\(\dfrac{5}{2}\)+\(\dfrac{9}{10}\)+\(\dfrac{3}{4}\)

= (\(\dfrac{4}{10}\)+\(\dfrac{15}{10}\)+\(\dfrac{9}{10}\))+\(\dfrac{3}{4}\)

= \(\dfrac{14}{5}\)+\(\dfrac{3}{4}\)

=\(\dfrac{56}{20}\)+\(\dfrac{15}{20}\)

= \(\dfrac{71}{20}\)

Nhớ tick cho mk nha~

a\\(\sqrt{49}+\sqrt{4}=7+2=9\)

b\\(\sqrt{0,25}-\sqrt{0.01}=0.5-01=0.4\)

c\\(\sqrt{\dfrac{16}{25}}-\sqrt{\dfrac{1}{81}}=\dfrac{4}{5}-\dfrac{1}{9}=\dfrac{31}{45}\)

d\\(\sqrt{64}-\sqrt{16}+\sqrt{\left(-3\right)^2}=8-4+3=7\)

e\\(2-\sqrt{0,36}=2-0.6=1.4\)

a) \(\sqrt{49}+\sqrt{4}=7+2=9\)

b) \(\sqrt{0,25}-\sqrt{0,01}=0,5-0,1=0,4\)

c) \(\sqrt{\dfrac{16}{25}}-\sqrt{\dfrac{1}{81}}=\dfrac{4}{5}-\dfrac{1}{9}=\dfrac{31}{45}\)

d) \(\sqrt{64}-\sqrt{16}+\sqrt{\left(-3\right)^2}=8-4+3=4+3=7\)

e) \(2-\sqrt{0,36}=2-\dfrac{3}{5}=\dfrac{10}{5}-\dfrac{3}{5}=\dfrac{7}{5}\)

b) \(\sqrt{\frac{25}{36}}=\sqrt{\frac{5^2}{6^2}}=\frac{5}{6}\)

a) \(\sqrt{\left(-0,001\right)}=\varnothing\)

c) \(-\sqrt{\frac{0,64}{81}}=-\sqrt{\frac{0,8^2}{9^2}}=-\frac{0,8}{9}=\frac{-4}{45}\)