\(-66\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)+1,24\cdot\left(-37\right)+63\cdot\left(-1,24\right)\)
\(=-66\cdot\dfrac{17}{66}+\left(-1,24\right)\cdot37+63\cdot\left(-1,24\right)\)
\(=-17+\left(1,24\right)\left(37+63\right)\)
\(=-17+\left(-1,24\right)\cdot100\)
\(=-17+\left(-124\right)\)
\(=-141\)
1. \(25\dfrac{1}{7}:\left(-\dfrac{5}{7}\right)-15\dfrac{1}{7}:\left(-\dfrac{5}{7}\right)+\dfrac{4}{5}\) 3. \(2\dfrac{2}{3}:\left\{\left[\left(3,72-0.02\right)\dfrac{10}{37}\right]:\dfrac{5}{6}+2,8\right\}-\dfrac{7}{15}\)
2. \(\left(3+\dfrac{4}{5}-\dfrac{5}{12}\right)\left(\dfrac{6}{7}-\dfrac{3}{5}\right)^2\)
4.23+3.\(\left(-\dfrac{1}{2}\right)^2\)-22.4+\(\left[\left(-2\right)^2:\dfrac{1}{2}\right]\)
Thực hiện phép tính (tính nhanh nếu có thể):
a) \(\left(\dfrac{1}{2}-\dfrac{1}{3}\right)-\left(\dfrac{5}{3}-\dfrac{3}{2}\right)+\left(\dfrac{7}{3}-\dfrac{5}{2}\right)\)
b) \(\left(\dfrac{3}{4}-1\dfrac{1}{6}\right)^2:\sqrt{\dfrac{25}{144}}\)
Thực hiện phép tính hợp lí (nếu có thể):
A = \(\dfrac{11}{9}.\dfrac{-3}{2}-\dfrac{11}{9}.\dfrac{15}{2}+\left(-2021\right)^0\)
Tính hợp lí:
A=\(\left(-2\right).(-1\dfrac{1}{2}).\left(-1\dfrac{1}{3}\right).\left(-1\dfrac{1}{4}\right)........\left(-1\dfrac{1}{2008}\right)\)
Ae giúp tôi với:
Cho A=\(1-\dfrac{2}{3}+\left(\dfrac{2}{3}\right)^2-\left(\dfrac{2}{3}\right)^3+...+\left(\dfrac{2}{3}\right)^{2018}-\left(\dfrac{2}{3}\right)^{2019}\)
Chứng tỏ A không thuộc tập hợp Z( tập hợp số nguyên).
Thank all !
Tìm x biết
a,\(\left|x-\dfrac{1}{3}\right|+\dfrac{4}{5}=\left|\left(-3,2\right)+\dfrac{2}{5}\right|b,\left(x-7\right)^{x+1}+\left(x-7\right)^{x+11}=0\)
Thực hiện phép tính (tính nhanh nếu có thể):
4) \(4\cdot\left(\dfrac{-1}{2}\right)^3+\left|-1\dfrac{1}{2}+\sqrt{\dfrac{9}{4}}\right|:\sqrt{25}\)
5) \(\left[6-3\cdot\left(\dfrac{-1}{3}\right)^2+\sqrt{\dfrac{1}{4}}\right]:\sqrt{0,\left(9\right)}\)
Tính hợp lí:
A=\(\dfrac{1}{2}-\left(\dfrac{-2}{5}\right)+\dfrac{1}{3}+\dfrac{5}{7}-\left(\dfrac{-1}{6}\right)+\left(\dfrac{-4}{35}\right)+\dfrac{1}{41}\)
Tính hợp lí:
A=\(\dfrac{1}{2}-\left(\dfrac{-2}{5}\right)+\dfrac{1}{3}+\dfrac{5}{7}-\left(\dfrac{-1}{6}\right)+\left(\dfrac{-4}{35}\right)+\dfrac{1}{41}\)
