a) ta có \(\frac{5}{24};\frac{15}{24};\frac{5}{8}\)
=>\(\frac{5}{24}< \frac{15}{24}< \frac{20}{24}\)quy đồng lên
b)\(\frac{4}{9};\frac{6+9}{6\cdot9};\frac{2}{3}\)
=>\(\frac{4}{9};\frac{15}{54};\frac{2}{3}\)
=>\(\frac{24}{54};\frac{15}{54};\frac{36}{54}\)
=>\(\frac{15}{54}< \frac{24}{54}< \frac{36}{54}\)
so sánh phân số sau:
a) \(\frac{5}{24}\), \(\frac{5+10}{24}\), \(\frac{5}{8}\)
b) \(\frac{4}{9}\), \(\frac{6+9}{6.9}\), \(\frac{2}{3}\)
a, tính:\(\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
b, tìm x biết:\(1\frac{1}{30}:(24\frac{1}{6}-24\frac{1}{5})-\frac{1\frac{1}{2}-\frac{3}{4}}{4x-\frac{1}{2}}=(-1\frac{1}{5}):(8\frac{1}{5}-8\frac{1}{3})\)
Bài 1: So Sánh phân số
a) \(\frac{5}{24}và\frac{5+10}{24}\) b) \(\frac{4}{9};\frac{6+9}{6.9};\frac{2}{3}\)
BÀI 2: Thực hiện phép tính
\(\left(-2\right)+\frac{-5}{8}\)
Bài 3: Tính
\(\frac{1}{2}+\frac{-1}{3}+\frac{1}{4}+\frac{-1}{5}+\frac{1}{6}+\frac{-1}{7}+\frac{1}{8}+\frac{1}{7}+\frac{-1}{6}+\frac{1}{5}+\frac{-1}{4}+\frac{1}{3}+\frac{-1}{2}\)
Bài 4: Tìm x
a) \(x=\frac{1}{6}+\frac{2}{5}\) b) \(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)
Bài 5: Cho \(A=\frac{1}{11}+\frac{1}{12}+\frac{1}{13}+...+\frac{1}{20}\) so sánh A và \(\frac{1}{2}\)
Bài 6:
\(\frac{3}{2}.\frac{4}{3}.\frac{5}{4}...\frac{101}{100}\)
Sắp xếp các phân số sau theo thứ tự tăng dần :
a)\(\frac{1}{-2};\frac{2}{3};\frac{-3}{5};\frac{-5}{-12};\frac{3}{2}\)
b)\(\frac{6}{-5};\frac{3}{4};\frac{-2}{-5};\frac{7}{-6};\frac{9}{-10}\)
c)\(\frac{4}{-15};\frac{-5}{-6};\frac{4}{-9};\frac{8}{12};\frac{-7}{21};\frac{24}{15}\)
bài 1:thực hiện phép tính :
a)\(\frac{3}{7}+\frac{5}{13}+\frac{4}{13}\)
b)\(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
c)\(\frac{2}{5}.\frac{1}{3}-\frac{2}{15}:\frac{1}{5}+\frac{3}{5}.\frac{1}{3}\)
d)\(\left(4-\frac{5}{12}\right):2+\frac{5}{24}\)
e)\(\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{-1}{19}\)
f)\(\frac{9}{27}+\frac{8}{24}+\frac{18}{27}-\frac{-16}{24}+\frac{2}{3}\)
g)\(\frac{-5}{21}+\frac{-2}{21}+\frac{8}{24}\)
h)\(\frac{-5}{9}+\frac{8}{15}+\frac{-2}{11}+\frac{4}{-9}+\frac{7}{15}\)
i)\(\frac{7}{25}.\frac{39}{-14}.\frac{50}{78}\)
m.n làm nhanh cho mình nhé, chiều mình phải nộp rồi! cảm ơn m.n!
Bài 1:
a, \(\frac{2}{5}.\frac{1}{3}-\frac{2}{15}:\frac{1}{5} +\frac{3}{5}.\frac{1}{3}\)
b, \(\frac{9}{27}+\frac{8}{24}+\frac{18}{27}-\frac{-16}{24}+\frac{2}{3}\)
c,\(\left(4-\frac{5}{12}\right):2+\frac{5}{24}\)
Cho \(M=\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+\frac{4}{5}+\frac{5}{6}+\frac{6}{7}+\frac{7}{8}+\frac{8}{9}+\frac{9}{10}\)
So sánh M với 1
1)tính
\(\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
2) tìm x biết
a)\(1\frac{1}{30}:24\frac{1}{6}-24\frac{1}{5}-\frac{1\frac{1}{2}-\frac{3}{4}}{4x-\frac{1}{2}}=\left(-1\frac{1}{15}\right):\left(8\frac{1}{5}-8\frac{1}{3}\right)\)
đúng mình tick
Tính giá trị biểu thức
a,\(A=\frac{24\cdot47-23}{24+47-23}\cdot\frac{3+\frac{3}{7}-\frac{3}{11}+\frac{3}{1001}-\frac{3}{13}}{\frac{9}{1001}-\frac{9}{13}+\frac{9}{7}-\frac{9}{11}+9}\)
b,\(M=\frac{1+2+2^2+2^3+...+2^{2012}}{2^{2014}-2}\)
c,\(A=81\cdot\left[\frac{12-\frac{12}{7}-\frac{12}{289}-\frac{12}{85}}{4-\frac{4}{7}-\frac{4}{289}-\frac{4}{85}}:\frac{5+\frac{5}{13}+\frac{5}{169}+\frac{5}{91}}{6+\frac{6}{13}+\frac{6}{169}+\frac{6}{91}}\right]:\frac{158158158}{711711711}\)
d,\(A=\frac{5\cdot\left(2^2.3^2\right)^9\cdot\left(2^2\right)^6-2\cdot\left(2^2\cdot3\right)^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)
