Các số sắp xếp théo thứ tự tăng dần là: \(\frac{-7}{9};\frac{-6}{9};\frac{-1}{12};0;\frac{1}{38};\frac{1}{3};\frac{1}{2};\frac{9}{11};\frac{3}{2}\)
-7/9;-6/9;-1/12;0;1/38;1/3;1/2;9/11;3/2.
sắp xếp theo thứ tự tăng dần : \(\frac{1}{3};\frac{1}{5};\frac{-2}{15};\frac{1}{6};\frac{-2}{-5};\frac{-1}{10};\frac{4}{15}\)
Tính nhanh giá trị biểu thức sau:
a) \(-\frac{9}{10}\cdot\frac{5}{14}+\frac{1}{10}\cdot\left(-\frac{9}{2}\right)+\frac{1}{7}\cdot\left(-\frac{9}{10}\right)\)
b)\(\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{6}+\frac{1}{11}\right)\cdot132\)
c)\(-\frac{2}{3}\cdot\left(\frac{8}{9}\cdot\frac{8}{13}-\frac{8}{27}\cdot\frac{3}{13}+\frac{4}{3}\cdot\frac{22}{39}\right)\)
Cho A= \(\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}+\frac{7}{11}}\)
B= \(\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
a, Rút gọn A= một cách hợp lý.
b, Tìm phân số \(\frac{A}{B}\).
bài 1 : tính
a)\(\frac{-5}{13}-\left(\frac{3}{5}+\frac{3}{13}-\frac{4}{10}\right)\) b) \(\left(\frac{3}{9}-\frac{9}{18}\right)+\frac{3}{6}-\left(\frac{1}{3}-\frac{1}{2}\right)-\frac{5}{15}\) c) \(\frac{9}{18}+\frac{16}{32}-\frac{12}{46}-\frac{9}{17}\) d) \(\left(\frac{14}{18}+\frac{-16}{27}\right)-\left(\frac{2}{3}-\frac{5}{15}\right)\)
+) A = ( 1,11 + 0,19 - 2,6 ) : ( 2,06 + 0,54 ) - ( \(\frac{1}{2}\) + \(\frac{1}{3}\) ) : 2
+) Tìm x :
a, (1,16 - x ) . 2,25 / 10 \(\frac{5}{9}\) - 7\(\frac{1}{4}\) . 2\(\frac{2}{11}\) = 75%
b) x + 25% .x = -1,25
c) x - 75% x = \(\frac{1}{4}\)
+) Tính nhanh nếu có thể :
a) 1\(\frac{1}{2}\) - 3\(\frac{3}{4}\) b) -8\(\frac{1}{6}\) - 7\(\frac{3}{2}\) c) 0,15 - 4,8 + 1,3 d) ( 2\(\frac{1}{3}\) + 3,5 ) : (-4\(\frac{1}{6}\) + 3\(\frac{1}{7}\) ) + 7,5
e) 11\(\frac{1}{4}\) + (2\(\frac{5}{7}\) + 5\(\frac{1}{4}\) ) f) \(\frac{4}{9}\) : ( \(\frac{1}{-7}\) + 6\(\frac{5}{9}\) :(-\(\frac{1}{7}\))
Tính giá trị biểu thức
A=1-2+3+4-5-6+7+8-9-.....+2007+2008-2009-2010
B=\(1-\frac{1}{6}-\frac{1}{12}-\frac{1}{20}-\frac{1}{30}-...-\frac{1}{9900}\)
tính giá trị biểu thức
P = \(\left[2\frac{11}{25}-0,84.\left(6\frac{8}{9}:2\frac{7}{12}-\frac{5}{12}.4\frac{4}{35}\right)\right]:\left[7,605:7\frac{1}{2}+3,086\right]\)
help me !!!!!!!!!!!
tim T biet T = \(\frac{2}{5}\)S mà S = \(\frac{\left(9\frac{3}{8}:5,2+3,4.2\frac{7}{34}\right):1\frac{9}{16}}{0,31.8\frac{2}{5}-5,61:27\frac{1}{2}}\)
Thực hiện phép tính ( hợp lí nếu có ) :
a) ( \(\frac{1}{4}\) + \(\frac{-5}{13}\) ) + ( \(\frac{2}{11}\) + \(\frac{-8}{13}\) + \(\frac{3}{4}\) )
b) ( \(\frac{21}{31}\) + \(\frac{-16}{7}\) ) + ( \(\frac{44}{53}\) + \(\frac{10}{31}\) ) + \(\frac{9}{53}\)
c) \(\frac{\frac{9}{45}-\frac{4}{13}-\frac{1}{3}}{\frac{3}{13}-\frac{1}{15}+\frac{2}{3}}\)
