Chương I : Số hữu tỉ. Số thực
Các câu hỏi tương tự
So sánh :
a . \(\dfrac{-119}{117}và\dfrac{-117}{115}\)
b. \(\dfrac{-22}{35}\) và \(\dfrac{-103}{177}\)
So sánh :
\(\dfrac{-119}{117}\) và \(\dfrac{-117}{115}\)
a, left(18dfrac{1}{3}:sqrt{225}+8dfrac{2}{3}.sqrt{dfrac{49}{4}}right): left[left(12dfrac{1}{3}+8dfrac{6}{7}right)-dfrac{left(sqrt{7}right)^2}{left(3sqrt{2}right)^2}right]: dfrac{1704}{445}b, dfrac{1}{1.2}+dfrac{1}{2.3}+...+dfrac{1}{99.100}c, left(1-dfrac{1}{2}right)xleft(1-dfrac{1}{3}right)x.....xleft(1-dfrac{1}{n+1}right) (n ϵ N)d, -66 x left(dfrac{1}{2}-dfrac{1}{3}+dfrac{1}{11}right) + 124 x -37 + 63 x -124e, dfrac{7}{4} x left(dfrac{33}{12}+dfrac{3333}{2020}+dfrac{333333}{303030}+dfrac{33333...
Đọc tiếp
a, \(\left(18\dfrac{1}{3}:\sqrt{225}+8\dfrac{2}{3}.\sqrt{\dfrac{49}{4}}\right)\): \(\left[\left(12\dfrac{1}{3}+8\dfrac{6}{7}\right)-\dfrac{\left(\sqrt{7}\right)^2}{\left(3\sqrt{2}\right)^2}\right]\): \(\dfrac{1704}{445}\)
b, \(\dfrac{1}{1.2}\)+\(\dfrac{1}{2.3}\)+...+\(\dfrac{1}{99.100}\)
c, \(\left(1-\dfrac{1}{2}\right)\)x\(\left(1-\dfrac{1}{3}\right)\)x.....x\(\left(1-\dfrac{1}{n+1}\right)\) (n ϵ N)
d, -66 x \(\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)\) + 124 x -37 + 63 x -124
e, \(\dfrac{7}{4}\) x \(\left(\dfrac{33}{12}+\dfrac{3333}{2020}+\dfrac{333333}{303030}+\dfrac{33333333}{42424242}\right)\)
Bài 1: Tính nhanh
a) left(2017^1right)^{2.4.6.8....2016}
b) 2017^{left(225-1^2right).left(225-2^2right).left(225-3^2right)....left(225-56^2right)}
Bài 2: Tính
A dfrac{2.5^{22}-9.5^{21}}{25^{10}}: dfrac{5.left(3.7^{15}-19.7^{14}right)}{7^{16}+3.7^{15}}
B dfrac{4^6.9^5+6^9.1^{20}}{-8^4.3^{12}-6^{11}}
C dfrac{6^3+3.6^2+3^3}{-27}
D dfrac{1}{1-dfrac{1}{1-2^{-1}}}+ dfrac{1}{1+dfrac{1}{1+2^{-1}}}
M 2^{10}-2^9-2^8-2^7-....-1
Giúp mk với. Mk cần gấp
Đọc tiếp
Bài 1: Tính nhanh
a) \(\left(2017^1\right)^{2.4.6.8....2016}\)
b) \(2017^{\left(225-1^2\right).\left(225-2^2\right).\left(225-3^2\right)....\left(225-56^2\right)}\)
Bài 2: Tính
A = \(\dfrac{2.5^{22}-9.5^{21}}{25^{10}}\): \(\dfrac{5.\left(3.7^{15}-19.7^{14}\right)}{7^{16}+3.7^{15}}\)
B = \(\dfrac{4^6.9^5+6^9.1^{20}}{-8^4.3^{12}-6^{11}}\)
C = \(\dfrac{6^3+3.6^2+3^3}{-27}\)
D = \(\dfrac{1}{1-\dfrac{1}{1-2^{-1}}}\)+ \(\dfrac{1}{1+\dfrac{1}{1+2^{-1}}}\)
M = \(2^{10}-2^9-2^8-2^7-....-1\)
Giúp mk với. Mk cần gấp 
Tính giá trị biểu thức :
A=\(\left[\dfrac{1\dfrac{11}{31}.4\dfrac{3}{7}-\left(15-6\dfrac{1}{3}.\dfrac{2}{19}\right)}{4\dfrac{5}{6}+\dfrac{1}{6}\left(12-5\dfrac{1}{3}\right)}\right].\dfrac{31}{50}\)
tìm các giá trị nguyên của x để biểu thức có giastrij nhỏ nhất
\(A=\dfrac{1}{x-3}\) \(B=\dfrac{7-x}{x-5}\) \(C=\dfrac{5x-19}{x-4}\)
1)Tính giá trị biểu thức:
dfrac{left(13dfrac{1}{4}-2dfrac{5}{27}-10dfrac{5}{6}right).230dfrac{1}{25}+46dfrac{3}{4}}{left(1dfrac{3}{7}+dfrac{10}{3}right):left(12dfrac{1}{3}-14dfrac{2}{7}right)}
2)Tìm x biết:
a) 42+dfrac{3}{7}.left|3x-1right|12
b) left|2x-1right|left|x+2right|
c) 2.3^x.3^218 với xin N
Đọc tiếp
1)Tính giá trị biểu thức:
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right).230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{7}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\)
2)Tìm x biết:
a) \(42+\dfrac{3}{7}.\left|3x-1\right|=12\)
b) \(\left|2x-1\right|=\left|x+2\right|\)
c) \(2.3^x.3^2=18\) với \(x\in N\)
Tính :
1, \(2016-1-\dfrac{1}{3}-\dfrac{1}{6}-\dfrac{1}{10}-\dfrac{1}{15}-...-\dfrac{1}{1225}\)
2, \(\dfrac{3}{2}+\dfrac{5}{4}+\dfrac{9}{8}+\dfrac{17}{16}+\dfrac{33}{32}+\dfrac{65}{64}-7\)
3, A= \(\dfrac{1}{3\cdot4}-\dfrac{1}{4\cdot5}-\dfrac{1}{5\cdot6}-...-\dfrac{1}{9\cdot10}\)
help me ~ mai mik phải nộp rồi
a) \(1\dfrac{4}{23}+\dfrac{5}{21}\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
b)\(\dfrac{3}{7}.19\dfrac{1}{3}-\dfrac{3}{7}.33\dfrac{1}{3}\)
c)\(15\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)-25\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)\)
d)\(\left(-\dfrac{2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)