-1/39 + -1/52 = -7/156
-6/9 + -12/16 = -17/12
-2/5 - - 3/11 [ (-) + ( -) = +] = -2/5 + 3/11 = -7/55
-34/37 - 74/ -85 = -152/3145
-5/9 : -7/18 = 10/7
-7/156
-17/12
-7/55
-152/3145
10/7
-1/39 + -1/52
-6/9 + -12/16
-2/5 - -3/11 -34/37 - 74/-85
-5/9 : -7/18
Giúp tớ với!! 3h10 đi học rồi
A) 5/4.-12/7
b) -4/3:13/9
c) -5/7.49/3:7/-6
D) (-9/25):6
giúp tớ với
tối phải đi học rồi
tính nhanh
B = 1/5 - 3/7 + 5/9 - 2/11+ 7/13 - 9/16 -7/13 +2/11 - 5/9 +3/7 -1/5
tính nhanh
B = 1/5 - 3/7 + 5/9- 2/11 +7/13 - 9/16 - 7/13 + 2/11 -5/9 +3/7 -1/5
tính nhanh
B = 1/5 - 3/7 + 5/9 - 2/11+ 7/13 - 9/16 -7/13 +2/11 - 5/9 +3/7 -1/5
Tính nhanh:
A = 1/3 - 3/4 - ( - 3/5 ) + 1/72 - 2/9 - 1/36 + 1/15
B = 1/ 5 - 3/7 + 5/9 - 2/11 + 7/13 - 9/16 - 7/13 + 2/11 - 5/9 + 3/7 - 1/5
C = 1/100 - 1/100 . 99 - 1/99 . 98 - 1/98 . 97 - ... - 1/3 . 2 - 1/ 2 . 1
bài 3 : Tính nhanh:
B= \(\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
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 : ( tính nhanh nếu có thể )
a) \(\left(\frac{11}{12}:\frac{33}{16}\right).\frac{3}{5}+\frac{7}{23}.\left[\left(\frac{-8}{6}+\frac{-45}{18}\right)\right]\)
b) \(\left(\frac{-2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
c) \(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)\)
d) \(\frac{-3}{4}.\frac{12}{-5}.\frac{-25}{6}+\left(-2\right).\frac{-38}{21}.\frac{-7}{4}.\frac{-3}{8}\)
