sssssssssooooooooooooossssssssssss $11)[(\frac13)^2.\frac{27}7+\sqrt{\frac{16}{49}}-3]:\frac47$ $12)\sqrt{16}.\sqrt4-\sqrt{25}+2\sqrt{49}$,Bài 2 : Tính bằng cách hợp lý nếu có thể :,$1)-\frac{11}8-1\frac4{11}+1\frac38+0,5-\frac5{41}$ $2)-(\frac37+\frac38)-(-\frac38+\frac47)$,$3)\frac{-5}{17}.\frac{31}{33}+\frac{-5}{17}.\frac2{33}+2\frac5{17}$ $4)\frac{12}{17}.\frac57-\frac{-12}7.\frac2{17}-\frac4{17}$,$5)\frac38.\frac{23}{14}-\frac38.\frac9{14}+(\frac38)^0$ $6)\frac{-3}{11}.\frac57+\frac57.\frac{-8}{11}+2\frac57$,$7)35\frac16:(-\frac45)-45\frac16:(\frac{-4}5)$ $8)\frac{\frac{-6}7+\frac6{19}-\frac6{31}}{\frac97-\frac9{19}+\frac9{31}}$,$9)(0,125)^{100}.8^{101}$ $10)-3,75.(-7,2)+2,8.3,75$

Question

Accepted Answer

Bài 2:

1) $\displaystyle \frac{-11}{8} -1\frac{4}{11} +1\frac{3}{8} +0,5-\frac{5}{41}$

$\displaystyle \begin{array}{{>{\displaystyle}l}}
=\left(\frac{-11}{8} +\frac{11}{8} ight) -\frac{15}{11} +\frac{1}{2} -\frac{5}{41}\
=\frac{-889}{902}
\end{array}$

2) $\displaystyle -\left(\frac{3}{7} +\frac{3}{8} ight) -\left(\frac{-3}{8} +\frac{4}{7} ight)$

$\displaystyle \begin{array}{{>{\displaystyle}l}}
=\frac{-3}{7} -\frac{3}{8} +\frac{3}{8} -\frac{4}{7}\
=\frac{-3}{7} -\frac{4}{7}\
=-1
\end{array}$

3) $\displaystyle \frac{-5}{17} .\frac{31}{33} +\frac{-5}{17} .\frac{2}{33} +2\frac{5}{17}$

$\displaystyle \begin{array}{{>{\displaystyle}l}}
=\frac{-5}{17}\left(\frac{31}{33} +\frac{2}{33} -2 ight)\
=\frac{-5}{17} .( -1)\
=\frac{5}{17}
\end{array}$

4) $\displaystyle \frac{12}{17} .\frac{5}{7} -\frac{-12}{7} .\frac{2}{17} -\frac{4}{17}$

\begin{array}{{>{\displaystyle}l}}
=\frac{2}{17}\left( 6.\frac{5}{7} +\frac{12}{7} -2 ight)\
=\frac{2}{17}\left(\frac{42}{7} -2 ight)\
=\frac{2}{17} .4\
=\frac{8}{17}
\end{array}$ $ $ $