\(=\left(\dfrac{7}{18}+\dfrac{3}{34}\right):\left[\dfrac{14}{4}\left(\dfrac{1}{9}-\dfrac{1}{13}+\dfrac{1}{14}-\dfrac{1}{18}+\dfrac{1}{13}-\dfrac{1}{17}\right)\right]\)

\(=\dfrac{73}{153}:\left[\dfrac{14}{4}\cdot\dfrac{73}{1071}\right]\)

\(=\dfrac{73}{153}:\dfrac{73}{306}=2\)

\(P=\left(\frac{7.9}{9.18}+\frac{7.3}{2.7.17}\right):\left(\frac{14}{117}+\frac{1}{18}+\frac{14}{221}\right)\)

\(P=\left(\frac{7}{18}+\frac{3}{34}\right):\left(..\right)\)

Tới đây bạn tự làm nốt.

bạn có thể gúp mình chi tiết hơn được không 

mình làm được rồi

Lấy nháp tính là ra :)))

a) Ta có: \(A=\left(\dfrac{63}{9\cdot18}+\dfrac{21}{14\cdot17}\right):\left(\dfrac{14}{9\cdot13}+\dfrac{14}{14\cdot18}+\dfrac{14}{3\cdot17}\right)\)

\(=\left(7\cdot\dfrac{9}{9\cdot18}+7\cdot\dfrac{3}{14\cdot17}\right):\left(14\left(\dfrac{1}{9\cdot13}+\dfrac{1}{14\cdot18}+\dfrac{1}{3\cdot17}\right)\right)\)

\(=\dfrac{7\left(\dfrac{1}{9}-\dfrac{1}{18}+\dfrac{1}{14}-\dfrac{1}{17}\right)}{14\cdot\dfrac{1}{4}\cdot\left(\dfrac{4}{9\cdot13}+\dfrac{4}{3\cdot17}+\dfrac{4}{14\cdot18}\right)}\)

\(=\dfrac{\dfrac{1}{9}-\dfrac{1}{18}+\dfrac{1}{14}-\dfrac{1}{17}}{\dfrac{1}{2}\left(\dfrac{1}{9}-\dfrac{1}{13}+\dfrac{1}{3}-\dfrac{1}{17}+\dfrac{1}{14}-\dfrac{1}{18}\right)}\)

\(=\dfrac{\dfrac{73}{1071}}{\dfrac{1}{2}\cdot\dfrac{4519}{13923}}=\dfrac{1898}{4519}\)

yutyugubhujyikiu

- A ở trên giữa các phân số là dấu " + " nha mấy bạn !

\(\frac{1}{2}+\left(\frac{16}{21}+\frac{27}{13}\right)-\left(\frac{14}{13}-\frac{5}{21}\right)\)

\(=\frac{1}{2}+\frac{16}{21}+\frac{27}{13}-\frac{14}{13}+\frac{5}{21}\)

\(=\left(\frac{16}{21}+\frac{5}{21}\right)+\left(\frac{27}{13}-\frac{14}{13}\right)+\frac{1}{2}\)

\(=1+1+\frac{1}{2}\)

\(=\frac{5}{2}\)

#)Giải :

\(\frac{1}{2}+\left(\frac{16}{21}+\frac{27}{13}\right)-\left(\frac{14}{13}-\frac{5}{21}\right)\)

\(=\frac{1}{2}+\frac{16}{21}+\frac{27}{13}-\frac{14}{13}+\frac{5}{21}\)

\(=\frac{1}{2}+\left(\frac{16}{21}+\frac{5}{21}\right)+\left(\frac{27}{13}-\frac{14}{13}\right)\)

\(=\frac{1}{2}+1+1\)

\(=2\frac{1}{2}=\frac{5}{2}\)

\(\frac{1}{2}+\left(\frac{16}{21}+\frac{27}{13}\right)-\left(\frac{14}{13}-\frac{5}{21}\right)\)

\(=\frac{1}{2}+\frac{16}{21}+\frac{27}{13}-\frac{14}{13}+\frac{5}{21}\)

\(=\frac{1}{2}+\left(\frac{16}{21}+\frac{5}{21}\right)+\left(\frac{27}{13}-\frac{14}{13}\right)\)

\(=\frac{1}{2}+1+1\)

\(=1+2+2\)

\(=5\)

a) \(\frac{-28}{19}\). \(\frac{\left(-38\right)}{14}\)= 4

b) \(\frac{-21}{16}\). \(\frac{\left(-24\right)}{7}\)= \(\frac{9}{2}\)

c) \(\frac{12}{17}\). \(\frac{\left(-34\right)}{9}\)= \(\frac{-8}{3}\)

d) \(\frac{\left(-15\right)}{4}\): \(\frac{21}{10}\)= \(\frac{-25}{14}\)

e) \(-2\frac{1}{7}\): \(-1\frac{1}{14}\)= 2

nhớ ủng hộ mik nha mn

a.=4

b.=119/24

c.= -8/3

d.= -25/14

Mình chỉ làm đc từng này thôi

\(a,\frac{-28}{19}.\frac{\left(-38\right)}{14}\)

\(=\frac{-28.\left(-38\right)}{19.14}\)

\(=\frac{-2.\left(-2\right)}{1.1}\)

\(=-2.\left(-2\right)=4\)

\(b,\frac{-21}{16}.\frac{\left(-24\right)}{7}\)

\(=\frac{-21.\left(-24\right)}{16.7}\)

\(=\frac{-3.\left(-3\right)}{2.1}\)

\(=\frac{9}{2}\)

\(c,\frac{12}{17}.\frac{\left(-34\right)}{9}\)

\(=\frac{12.\left(-34\right)}{17.9}\)

\(=\frac{4.\left(-2\right)}{1.3}\)

\(=\frac{-8}{3}\)

\(d,\frac{\left(-15\right)}{4}:\frac{21}{10}\)

\(=\frac{\left(-15\right)}{4}.\frac{10}{21}\)

\(=\frac{\left(-5\right).5}{2.7}\)

\(=\frac{-25}{14}\)

\(e,-2\frac{1}{7}:\left(-1\frac{1}{14}\right)\)

\(=\frac{-15}{7}:\frac{-15}{14}\)

\(=\frac{-15}{7}.\frac{14}{-15}\)

\(=\frac{1.2}{1.1}\)

\(=2\)

                                 Cảm ơn mình bằng 1 dấu tích đúng nha \(!!!\)