130 cm

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

=\(\frac{44}{13}\)

\(\dfrac{10}{13}\times100=\dfrac{1000}{13}cm\)

130cm

`1000/13 cm`

Đổi 1m = 100cm

     Suy ra: 13 phần 10 m là: 

                       100 : 10 x 13 = 130 (cm)

                                               Đáp số : 130cm

130 cm nha bạn 

130 m bn

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

=\(\frac{1}{7}.\frac{15}{13}+\frac{1}{7}.\frac{5}{13}.12-\frac{1}{7}.\frac{10}{3}\)

=\(\frac{1}{7}\left(\frac{15}{13}+\frac{60}{13}+\frac{10}{3}\right)\)

=\(\frac{1}{7}\left(\frac{75}{13}-\frac{10}{3}\right)=\frac{1}{7}.\left(\frac{75.3-13.10}{39}\right)=\frac{1}{7}.\frac{95}{39}\)

=\(\frac{95}{273}\)

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{15}{13}+\frac{5.12}{13}.\frac{1}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\left(\frac{15}{13}+\frac{60}{13}\right)-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{75}{13}-\frac{10}{21}\)

= \(\frac{75}{91}-\frac{10}{21}\)

= \(\frac{95}{273}\)

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{15}{13}+\frac{1}{7}.\frac{5}{13}.12-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\left(\frac{15}{13}+\frac{60}{13}-\frac{10}{3}\right)\)

= \(\frac{1}{7}.\left(\frac{75}{13}-\frac{10}{3}\right)\)

= \(\frac{1}{7}.\frac{95}{39}\)

= \(\frac{95}{273}\).

Chúc bạn học tốt!

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 ~~

Cảm ơn mấy bạn nha ! Các bạn học giỏi quá tớ chắc phải học thêm nhiều

b)\(\frac{x-1}{x+5}=\frac{6}{7}\)

\(\Leftrightarrow7x-7=6x+30\)

\(\Leftrightarrow7x-6x=30+7\)

\(\Leftrightarrow x=37\)

\(M=\frac{17}{5}\cdot\frac{-31}{125}\cdot\frac{1}{2}\cdot\frac{10}{17}\cdot\frac{-1}{2^3}\)

\(M=\frac{17}{5}\cdot\frac{-31}{125}\cdot\frac{1}{2}\cdot\frac{10}{7}\cdot\frac{-1}{8}\)

\(M=\left(\frac{17}{5}\cdot\frac{10}{17}\cdot\frac{1}{2}\right)\cdot\frac{-31}{125}\cdot\frac{-1}{8}\)

\(M=1\cdot\frac{31}{1000}=\frac{31}{1000}\)

\(P=\frac{6}{7}\cdot\frac{8}{13}+\frac{6}{9}\cdot\frac{9}{7}-\frac{3}{13}\cdot\frac{6}{7}=\frac{6}{7}\cdot\frac{8}{13}+\frac{6}{7}\cdot1-\frac{3}{13}\cdot\frac{6}{7}\)

\(=\frac{6}{7}\left(\frac{8}{13}+1-\frac{3}{13}\right)=\frac{6}{7}\left(\frac{8}{3}+\frac{13}{13}-\frac{3}{13}\right)=\frac{6}{7}\cdot\frac{18}{13}=\frac{108}{91}\)