\(\frac{13}{10}\)m = .....cm
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Ta có: M=\(\frac{155-\frac{10}{7}-\frac{5}{11}+\frac{5}{23}}{403-\frac{26}{7}-\frac{13}{11}+\frac{13}{23}}\)+\(\frac{\frac{3}{5}+\frac{3}{13}-0,9}{\frac{7}{91}+0,2-\frac{3}{10}}\)
=\(\frac{5.\left(31-\frac{2}{7}-\frac{1}{11}+\frac{1}{23}\right)}{13.\left(31-\frac{2}{7}-\frac{1}{11}+\frac{1}{23}\right)}\)+\(\frac{\frac{9}{15}+\frac{9}{39}-\frac{9}{10}}{\frac{1}{13}+\frac{1}{5}+\frac{3}{10}}\)
=\(\frac{5}{13}\)+\(\frac{9.\left(\frac{1}{15}+\frac{1}{39}-\frac{1}{10}\right)}{3.\left(\frac{1}{39}+\frac{1}{15}-\frac{1}{10}\right)}\)
=\(\frac{5}{13}\)+\(\frac{9}{3}\)
=\(\frac{5}{13}\)+3
=\(\frac{44}{13}\)
Đổi 1m = 100cm
Suy ra: 13 phần 10 m là:
100 : 10 x 13 = 130 (cm)
Đáp số : 130cm
\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)
=\(\frac{1}{7}.\frac{15}{13}+\frac{1}{7}.\frac{5}{13}.12-\frac{1}{7}.\frac{10}{3}\)
=\(\frac{1}{7}\left(\frac{15}{13}+\frac{60}{13}+\frac{10}{3}\right)\)
=\(\frac{1}{7}\left(\frac{75}{13}-\frac{10}{3}\right)=\frac{1}{7}.\left(\frac{75.3-13.10}{39}\right)=\frac{1}{7}.\frac{95}{39}\)
=\(\frac{95}{273}\)
\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)
= \(\frac{1}{7}.\frac{15}{13}+\frac{5.12}{13}.\frac{1}{7}-\frac{1}{7}.\frac{10}{3}\)
= \(\frac{1}{7}.\left(\frac{15}{13}+\frac{60}{13}\right)-\frac{1}{7}.\frac{10}{3}\)
= \(\frac{1}{7}.\frac{75}{13}-\frac{10}{21}\)
= \(\frac{75}{91}-\frac{10}{21}\)
= \(\frac{95}{273}\)
a) =40013cm vuông
b) =6m vuông
c) =0,25m vuông
d) =30dm vuông
e) =5dm vuông 7cm vuông
\(4m^213cm^2=40013cm^2\)
\(600dm^2=6m^2\)
\(\frac{1}{4}m^2=0,25m^2\)
\(\frac{3}{10}m^2=30dm^2\)
\(507cm^2=5dm^27cm^2\)
TK nha bn ~~
b)\(\frac{x-1}{x+5}=\frac{6}{7}\)
\(\Leftrightarrow7x-7=6x+30\)
\(\Leftrightarrow7x-6x=30+7\)
\(\Leftrightarrow x=37\)
\(M=\frac{17}{5}\cdot\frac{-31}{125}\cdot\frac{1}{2}\cdot\frac{10}{17}\cdot\frac{-1}{2^3}\)
\(M=\frac{17}{5}\cdot\frac{-31}{125}\cdot\frac{1}{2}\cdot\frac{10}{7}\cdot\frac{-1}{8}\)
\(M=\left(\frac{17}{5}\cdot\frac{10}{17}\cdot\frac{1}{2}\right)\cdot\frac{-31}{125}\cdot\frac{-1}{8}\)
\(M=1\cdot\frac{31}{1000}=\frac{31}{1000}\)
\(P=\frac{6}{7}\cdot\frac{8}{13}+\frac{6}{9}\cdot\frac{9}{7}-\frac{3}{13}\cdot\frac{6}{7}=\frac{6}{7}\cdot\frac{8}{13}+\frac{6}{7}\cdot1-\frac{3}{13}\cdot\frac{6}{7}\)
\(=\frac{6}{7}\left(\frac{8}{13}+1-\frac{3}{13}\right)=\frac{6}{7}\left(\frac{8}{3}+\frac{13}{13}-\frac{3}{13}\right)=\frac{6}{7}\cdot\frac{18}{13}=\frac{108}{91}\)
13/10 m = 130 cm
\(\frac{13}{10}=130cm\)
nha bn
kb nhé...!!!