trả lời dùm mình đi

viết rõ lại cái đề giùm tui tui mới làm được

a. 6 và 5/3 + 7 và 13/8 +3 và 1/3- 4 và 5/8

=23/3+69/8+4/3-37/8

=391/24+4/3+37/8=141/8-37/8=103/8

b.=(27/5+69/11)-(17/5-52/11)

=642/55+73/55=13

        3/7 *14/5 - 1/2 = 6/5-1/2 = 7/10

        2/5 - 3/5 *5/10 = 2/5  - 3/10 = 1/10

        4/13 *5/11 + 4/13 *6/11 - 4/13

        = 4/13*5/11 +4/13 *6/11 - 4/13 *1

        = 4/13 *(5/11+ 6/11 - 1)

        = 4/13 *0

        =0

Bài 1: Tính

1/ \(\dfrac{-2}{-5}-\left(\dfrac{-4}{3}\right)\)

\(=\dfrac{2}{5}-\left(\dfrac{-4}{3}\right)\)

\(=\dfrac{6}{15}-\left(\dfrac{-20}{15}\right)\)

\(=\dfrac{6-\left(-20\right)}{15}\)

\(=\dfrac{26}{15}\)

2/ \(\left(\dfrac{-2}{4}-\dfrac{1}{2}\right):\dfrac{2}{3}\)

\(=\left(\dfrac{-2}{4}-\dfrac{2}{4}\right):\dfrac{2}{3}\)

\(=-1:\dfrac{2}{3}\)

\(=-1.\dfrac{3}{2}\)

\(=\dfrac{-3}{2}\)

3/ \(\dfrac{5}{12}.\dfrac{17}{11}-\dfrac{5}{12}.\dfrac{7}{11}+\dfrac{5}{12}.\dfrac{1}{11}\)

\(=\dfrac{5}{12}.\left(\dfrac{17}{11}-\dfrac{7}{11}+\dfrac{1}{11}\right)\)

\(=\dfrac{5}{12}.\left(\dfrac{17-7+1}{11}\right)\)

\(=\dfrac{5}{12}.1\)

\(=\dfrac{5}{12}\)

tách ra bn

khó nhìn quá:V

Chóng mặttttttttttttttt!

m=\(\frac{\frac{3}{5}+\frac{3}{7}-\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}=\frac{3\cdot\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}{4\cdot\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}\)

m=\(\frac{3}{4}\)

theo đề

m=3/4

hok tốt

\(\dfrac{3}{5}\cdot\dfrac{11}{4}-\dfrac{1}{5}\cdot\dfrac{11}{4}+\dfrac{13}{5}\cdot\dfrac{11}{4}\)

\(=\dfrac{11}{4}\cdot\left(\dfrac{3}{5}-\dfrac{1}{5}+\dfrac{13}{5}\right)\)

\(=\dfrac{11}{4}\cdot3\)

\(=\dfrac{33}{4}\)

#AEZn8

\(=\dfrac{11}{4}\left(\dfrac{3}{5}-\dfrac{1}{5}+\dfrac{13}{5}\right)=\dfrac{11}{4}\cdot\dfrac{14}{5}=\dfrac{154}{20}=\dfrac{77}{10}\)

a,\(\left(\dfrac{-2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)

\(=\left(-\dfrac{2}{3}+\dfrac{3}{7}\right).\dfrac{5}{4}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right).\dfrac{5}{4}\)

\(=\left(\dfrac{-2}{3}+\dfrac{3}{7}+\dfrac{-1}{3}+\dfrac{4}{7}\right).\dfrac{5}{4}\)

\(=\left(-1+1\right).\dfrac{5}{4}=0\)

Chúc bạn học tốt!!!

Câu b làm tương tự!

a) Đoàn Đức Hiếu

b) \(\dfrac{5}{9}:\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}\right)\)

\(=\dfrac{5}{9}:\left(-\dfrac{3}{22}\right)+\dfrac{5}{9}:\left(-\dfrac{3}{5}\right)\)

\(=-\dfrac{5}{9}\cdot\dfrac{22}{3}-\dfrac{5}{9}\cdot\dfrac{5}{3}\)

\(=-\dfrac{110}{27}-\dfrac{25}{27}\)

\(=-5\)

a) 5.(-2)-(-3).(-4)=(-10).(-3).(-4)
=30.(-4)
=-120

b) \(\dfrac{13}{7}-\dfrac{3}{14}=\dfrac{13}{7}+\dfrac{-3}{14}=\dfrac{26}{14}+\dfrac{-3}{14}=\dfrac{23}{14}\)

c) chả biết bạn viết cái j

làm hộ tớ  nhé

ngu the  xcuiegudg

sao chửi người ta ngu có khi còn ngu hơn người ta nữa ở đó mà lên giọng