\(\dfrac{27}{23}+\dfrac{5}{21}-\dfrac{4}{23}+\dfrac{6}{21}-\dfrac{1}{2}\)
\(=\left(\dfrac{27}{23}-\dfrac{4}{23}\right)+\left(\dfrac{5}{21}+\dfrac{6}{21}\right)-\dfrac{1}{2}\)
\(=1+\dfrac{11}{21}-\dfrac{1}{2}\)
\(=\dfrac{32}{21}-\dfrac{1}{2}\)
\(=\dfrac{43}{42}\)
Bài 1:
a) ( 9/25 - 2.18 ) : 3 4/5 + 0,2 )
b) 3/8 . 19 1/3 - 3/8 . 33 1/3
c) 1 4/23 + 5/21 - 4/23 + 0.5 + 16/21
d) 2^12 . 3^6 - 4^6 . 81 tất cả phần (2^2 . 3)^5 + 8^1 . 3^5
e) 4. ( -1/2)^3 - 2.(-1/2)^2 +3 . (-1/2)+1
a) -3/4 . 12/-5 . (-25/6)
b) (11/12 : 33/16) .3/5
c) (-2) . -38/21 . -7/4 . (-3/8)
d) 7/23 . [ ( -8/6) - 45/18 ]
Đề bài: Tìm x thuộc Z
a. -23/5 . 13/6 < x< -13/5 . 21/5
b. -13/3. (1/2 - 1/6) < x< -2/3. (1/3 - 1/2 - 3/4)
(Mọi người giúp mình bài này với)
So sánh
P1=(-0,25).\(\dfrac{4}{17}\).(\(-3\dfrac{5}{21}\))(\(-\dfrac{7}{23}\))
P2=(\(-\dfrac{23}{29}\))(\(\dfrac{-15}{27}\)).0,125.\(3\dfrac{1}{5}\)
P3=\(\dfrac{-5}{13}.\dfrac{-4}{13}.\dfrac{-3}{13}.....\dfrac{4}{13}.\dfrac{5}{13}\)
Thực hiện phép tính hợp lí;
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
b) \(\dfrac{3}{8}.19\dfrac{1}{3}-\dfrac{3}{8}.33\dfrac{1}{3}\)
c) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
1) Tính bằng cách hợp lí nếu có thể:
a) \(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)
b) \(\frac{3}{7}.19\frac{1}{3}-\frac{3}{7}.33\frac{1}{3}\)
c) \(9.\left(-\frac{1}{3}\right)^3+\frac{1}{3}\)
d) \(15\frac{1}{4}:\left(-\frac{5}{7}\right)-25\frac{1}{4}:\left(-\frac{5}{7}\right)\)
2 Thực hiện phép tính
\(\frac{17}{9}-\frac{17}{9}:\left(\frac{7}{3}+\frac{1}{2}\right)\)
\(\frac{4}{3}.\frac{2}{5}-\frac{3}{4}.\frac{2}{5}\)
\(-\frac{3}{4}.5\frac{3}{13}-0.75.\frac{36}{13}\)
\(3.\left(-\frac{4}{3}\right)^2-\frac{7}{3}\)
\(-\frac{5}{7}.\frac{3}{11}+\frac{-5}{7}.\frac{8}{11}+3\frac{5}{7}\)
\(32\frac{1}{7}:\left(\frac{-5}{4}\right)-47\frac{1}{7}:\left(\frac{-5}{4}\right)\)
\(\left(\frac{2}{3}+\frac{1}{2}\right)^2-\frac{1}{12}\\ \frac{1}{4}-\frac{5}{12}:\frac{1}{6}+\frac{-6}{5}\\ \frac{17}{21}+\frac{5}{23}-\frac{1}{2}+\frac{4}{21}-1\frac{5}{23}\)
\(\left(-3\right)^2+\sqrt{\frac{16}{25}}-\sqrt{9}+\frac{\sqrt{81}}{3}\)
Thực hiện phép tính ( bằng cách hợp lí nếu có thể)
a) \(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)
b) \(\frac{3}{7}.19\frac{1}{3}-\frac{3}{7}.33\frac{1}{3}\)
c) \(9.\left(\frac{-1}{3}\right)^3\) + \(\frac{1}{3}\)
d) \(15\frac{1}{4};\left(\frac{-5}{7}\right)-25\frac{1}{4}:\left(\frac{-5}{7}\right)\)
\(\frac{2}{6} + \frac{9}{20} - \frac{11}{30} + \frac{13}{42} - \frac{15}{56} + \frac{17}{72} - \frac{19}{90} + \frac{21}{110} - \frac{23}{132}\)