\(18:\left(\dfrac{1111}{3636}+\dfrac{141414}{727272}-\dfrac{808}{1818}\right)\)
=18:\(\left(\dfrac{11}{36}+\dfrac{7}{36}-\dfrac{4}{9}\right)=18:\left(\dfrac{11+7-16}{36}\right)\)
=18:\(\dfrac{1}{18}\)
=324
TICK hộ nhé các bạn
\(27\cdot\left(\dfrac{373737}{424242}+\dfrac{373737}{565656}+\dfrac{373737}{727272}\right)\)
Tính:
a. \(\dfrac{-5}{14}-\dfrac{2}{14}+\dfrac{1}{8}+\dfrac{1}{8}\)
b.\(\dfrac{-5}{22}-1+\dfrac{3}{2}-\dfrac{6}{22}\)
c.\(\dfrac{2}{5}+\dfrac{5}{4}+(\dfrac{-2}{5}+\dfrac{5}{4})-\dfrac{5}{2}\)
d.\(\dfrac{-1}{2}+\dfrac{1}{4}+\dfrac{2}{8}-\dfrac{11}{77}\)
làm nhanh hộ mình nha!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
BT2: Tính nhanh
7)\(\dfrac{-19}{34}\left(\dfrac{17}{19}+\dfrac{49}{18}\right)+\dfrac{49}{18}\left(\dfrac{19}{34}-\dfrac{18}{7}\right)\)
8)\(\dfrac{29}{32}\left(\dfrac{41}{36}-\dfrac{32}{58}\right)-\dfrac{41}{36}\left(\dfrac{29}{32}+\dfrac{18}{41}\right)\)
b1: rút gọn các pân số sau
\(\dfrac{-14}{-52}\) \(\dfrac{36}{-10}\)
\(\dfrac{-35}{-156}\) \(\dfrac{-360}{480}\)
\(\dfrac{3.5}{20.33}\) \(\dfrac{-4.56}{16.32}\)
\(\dfrac{18.9.-18}{2.20}\) \(\dfrac{8.6-8.10}{16}\)
b2:tìm x thuộc z:
\(\dfrac{2}{7}\)=\(\dfrac{x}{56}\)
\(\dfrac{x}{-5}\)=\(\dfrac{36}{45}\)
\(\dfrac{42}{48}\)=\(\dfrac{-7}{x}\)
\(\dfrac{-30}{x}\)=\(\dfrac{6}{-13}\)
các bn trình bày hộ mk lun nha
Tính các tổng sau bằng cách hợp lý nhất
\(A=\dfrac{ }{\dfrac{-1}{2}+\dfrac{3}{5}+\dfrac{-1}{9}+\dfrac{1}{127}+\dfrac{-7}{18}+\dfrac{4}{35}+\dfrac{2}{7}}\)
\(B=\dfrac{ }{\dfrac{1}{1.2.3}+\dfrac{1}{2.3.4}+\dfrac{1}{3.4.5}+...+\dfrac{1}{98.99.100}}\)
m.n gp mk nha cái gạch trên mỗi câu ko có ý nghĩa gì đâu
Tính nhanh nếu có thể
a, (-18 + 25) - (125-18+25)
b, (\(\dfrac{1}{3}\) - \(\dfrac{1}{4}\)- \(\dfrac{1}{12}\)) X (\(\dfrac{1}{2011}\)- \(\dfrac{1}{2012}\))
HELP ME, PLEASE!!!!!!! X là nhân nha các bạn
So sánh:
\(A=\dfrac{11.13.15+33.39.45+55.65.75+99.117.135}{11.13.17+39.45.51+65.75.85+117.135.153}\)
\(B=\dfrac{1111}{1717}\)
BT2: Tính nhanh:
5) \(\dfrac{15}{7}\left(\dfrac{1}{5}-\dfrac{46}{45}\right)+\dfrac{46}{45}\left(\dfrac{15}{7}-\dfrac{45}{46}\right)\)
6) \(\dfrac{43}{47}\left(\dfrac{18}{37}+\dfrac{47}{43}\right)-\dfrac{18}{37}\left(\dfrac{43}{47}+\dfrac{37}{36}\right)\)
Giúp mình với: \(\dfrac{2}{1}.\dfrac{4}{3}.\dfrac{6}{5}....\dfrac{200}{199}\)
Chứng minh: 201<\(S^2\)<400
nhanh hộ mình nha cần đáp án và cách làm gấp
