\(360:12.2+\left\{\left(11-4\right)^3-343\right\}.2017^{2018}\)
\(=30.2+\left\{7^3-343\right\}.2017^{2018}\)
\(=60+\left\{343-343\right\}.2017^{2018}\)
\(=60+0.2017^{2018}\)
\(=60+0\)
\(=60\)
a) \(\frac{2}{5}+\left(-\frac{4}{3}\right)+\left(-\frac{1}{2}\right)\)
b) \(\frac{5}{8}-\left(-\frac{2}{5}-\frac{3}{10}\right)\)
c) \(\frac{1}{3}-\left[\left(-\frac{5}{4}\right)-\left(\frac{1}{4}+\frac{3}{8}\right)\right]\)
d) \(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\)
e) \(\left(-\frac{1}{3}+\frac{5}{6}\right).11-7\)
f) \(\left(-\frac{5}{9}\right).\frac{3}{11}+\left(-\frac{13}{18}\right).\frac{3}{11}\)
tính B:
B=\(\left(2017-\dfrac{1}{4}-\dfrac{2}{5}-\dfrac{3}{6}-\dfrac{4}{7}-...-\dfrac{2017}{2020}\right):\left(\dfrac{1}{20}+\dfrac{1}{25}+\dfrac{1}{30}+\dfrac{1}{35}+...+\dfrac{1}{10100}\right)\)là:
Các anh chị giải giùm em ::::::::::::))))))))))))))))))))
\(G=\dfrac{\left(-2\right)}{3}+\dfrac{\left(-5\right)}{7}+\dfrac{2}{3}+\dfrac{\left(-2\right)}{7}\)
\(H=\dfrac{\left(-5\right)}{7}.\dfrac{2}{11}+\dfrac{\left(-5\right)}{7}.\dfrac{9}{11}\)
\(E=\dfrac{5}{7}.\dfrac{12}{11}+\dfrac{5}{7}.\dfrac{12}{11}-\dfrac{5}{7}.\dfrac{17}{11}\)
Tính giá trị biểu thức
thực hiện phép tính
a (-7/12+0,25): 2/3
b √4/9 + \(\left(-\dfrac{1}{2^{ }}\right)^3\) - |-3/11| . 11/8
A= \(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
Bài 1:
a. \(\left(5^{2010}+5^{2012}+5^{2014}\right):\left(5^{2011}+5^{2009}+5^{2007}\right)\)
b. \(\left(-\dfrac{7}{45}\right)-\left(-\dfrac{1}{4}\right)-\left(-\dfrac{3}{5}\right)+\dfrac{1}{12}+\dfrac{2}{3}+\dfrac{1}{39}-\left(-\dfrac{5}{9}\right)\)
So sánh A; B; C biết
A = \(\left(-\dfrac{43}{51}\right).\left(-\dfrac{19}{80}\right)\)
B = \(\left(-\dfrac{7}{13}\right).\left(-\dfrac{4}{65}\right).\left(-\dfrac{8}{31}\right)\)
C = \(\dfrac{-5}{10}.\dfrac{-4}{10}.\dfrac{-3}{10}...\dfrac{3}{10}.\dfrac{4}{10}.\dfrac{5}{10}\)
Giải cho mk những câu sau:
a)\(\left(a+2\right)⋮a\)
b)\(\left(a+5\right)⋮\left(a+1\right)\)
c)\(\left(a^2+3\right)⋮\left(a+1\right)\)
d)\(\left(2a+1\right)\left(b-3\right)=14\)
e)\(\left(3a+2\right)\left(b+2\right)=24\)
Giaỉ hộ bạn Trần Nhật Tiến
\(a,\dfrac{12}{3n-1}\in Z\)
\(\Rightarrow3n-1\inƯ\left(12\right)\)
\(\Rightarrow3n-1\in\left\{-12;-6;-4;-3l-2;-1;1;2;3;4;6;12\right\}\)
\(\Rightarrow n\in\left\{1;0;-1\right\}\)
b) \(\dfrac{2n+3}{7}\in Z\)
\(\Rightarrow2n+3⋮7\)
\(\Rightarrow2\left(n-2\right)+7⋮7\)
\(\Rightarrow n-2⋮7\)
\(\Rightarrow n=7k+2\left(k\in Z\right)\)
