A. \[13\frac{4}{5}\]
B. \[12\frac{1}{5}\]
C. \[ - 3\frac{4}{5}\]
D. \[10\frac{4}{5}\]
Giải bởi Vietjack
\[A = \left( {4\frac{5}{{17}} - 3\frac{4}{5} + 8\frac{{15}}{{29}}} \right) - \left( {3\frac{5}{{17}} - 6\frac{{14}}{{29}}} \right)\]
\[A = 4\frac{5}{{17}} - 3\frac{4}{5} + 8\frac{{15}}{{29}} - 3\frac{5}{{17}} + 6\frac{{14}}{{29}}\]
\[A = \left( {4\frac{5}{{17}} - 3\frac{5}{{17}}} \right) + \left( {8\frac{{15}}{{29}} + 6\frac{{14}}{{29}}} \right) - 3\frac{4}{5}\]
\[A = \left( {4 - 3} \right) + \left( {\frac{5}{{17}} - \frac{5}{{17}}} \right) + \left( {8 + 6} \right) + \left( {\frac{{15}}{{29}} + \frac{{14}}{{29}}} \right) - 3\frac{4}{5}\]
\[A = 1 + 0 + 14 + 1 - 3\frac{4}{5}\]
\[A = 16 - 3\frac{4}{5}\]
\[A = 15\frac{5}{5} - 3\frac{4}{5} = 12\frac{1}{5}\]
Đáp án cần chọn là: B
a) 125dm2b) 218cm2c) 240dm2d) 34cm2
\[3\frac{3}{4}\] tạ; \[\frac{{377}}{{100}}\] tạ; \[\frac{7}{2}\] tạ; \[3\frac{{45}}{{100}}\] tạ; 365 kg.
