\(\dfrac{8^5.16^3}{4^{13}}-\dfrac{3^{33}.4^5}{6^{33}}=\dfrac{\left(2^3\right)^5.\left(2^4\right)^3}{\left(2^2\right)^{13}}-\dfrac{3^{33}.\left(2^2\right)^3}{\left(2.3\right)^{33}}\)
\(=\dfrac{2^{15}.2^{12}}{2^{26}}-\dfrac{3^{33}.2^6}{2^{33}.3^{33}}\)
\(=2-\dfrac{1}{2^{27}}\)
Thực hiện phép tính hợp lí;
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
b) \(\dfrac{3}{8}.19\dfrac{1}{3}-\dfrac{3}{8}.33\dfrac{1}{3}\)
c) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
Bài 1: Tính
a) \(\dfrac{1}{5}:\dfrac{1}{10}-\dfrac{1}{3}\left(\dfrac{6}{5}-\dfrac{9}{4}\right)\)
b) \(\dfrac{1}{2}\left(\dfrac{4}{3}+\dfrac{2}{5}\right)-\dfrac{3}{4}\left(\dfrac{8}{9}+\dfrac{16}{3}\right)\)
c) \(\dfrac{6}{7}:\left(\dfrac{3}{26}-\dfrac{3}{13}\right)+\dfrac{6}{7}\left(\dfrac{1}{10}-\dfrac{8}{5}\right)\)
ĐỀ 1:
1. Tính:
a. \(\dfrac{7}{23}\left[\left(\dfrac{-8}{6}\right)-\dfrac{45}{18}\right]\)
b. \(\dfrac{1}{5}:\dfrac{1}{10}-\dfrac{1}{3}\left(\dfrac{6}{5}-\dfrac{9}{4}\right)\)
c. \(\dfrac{3}{5}.\left(\dfrac{-8}{3}\right)-\dfrac{3}{5}:\left(-6\right)\)
d. \(\dfrac{1}{2}\left(\dfrac{4}{3}+\dfrac{2}{5}\right)-\dfrac{3}{4}\left(\dfrac{8}{9}+\dfrac{16}{3}\right)\)
e. \(\dfrac{6}{7}:\left(\dfrac{3}{26}-\dfrac{3}{13}\right)+\dfrac{6}{7}\left(\dfrac{1}{10}-\dfrac{8}{5}\right)\)
2. Tìm x, biết:
a. \(1\dfrac{2}{5}x+\dfrac{3}{7}=\dfrac{4}{5}\)
b. |x - 1,5| = 2
c. \(\dfrac{4}{5}-\left|x-\dfrac{1}{6}\right|=\dfrac{2}{3}\)
d. 3x . 2x = 216
e. \(\dfrac{1}{2}\left(x-\dfrac{1}{3}\right)+\dfrac{-1}{2}=\dfrac{3}{4}\)
* Lm nhanh nha
Ths you <3
\(\dfrac{3}{8}\cdot27\dfrac{1}{5}-51\dfrac{1}{5}\cdot\dfrac{3}{8}+19\)
\(\dfrac{35\dfrac{1}{6}}{\left(\dfrac{-4}{5}\right)}-\dfrac{46\dfrac{1}{6}}{\left(\dfrac{-4}{5}\right)}\)
\(\dfrac{\left(\dfrac{-3}{4}+\dfrac{2}{5}\right)}{\dfrac{3}{7}+\dfrac{\left(\dfrac{3}{5}+\dfrac{-1}{4}\right)}{\dfrac{3}{7}}}\)
tính hợp lí
\(\dfrac{3}{8}.19\dfrac{1}{3}-\dfrac{3}{8}.33\dfrac{1}{3}\)
Tìm nghiệm của đã thức f(x)= 5x -29a với
a= \((\)1+\(\dfrac{7}{9}\)\()\) \((1+\dfrac{7}{20})\)\((1+\dfrac{22}{33})\).....\((1+\dfrac{7}{2900})+(81-\)\(\dfrac{3^3}{4}\)\()\)\((81-\dfrac{3^3}{5})(81-\dfrac{3^3}{6}).....(81-\dfrac{3^{2014}}{2017})\)
Giúp với !!!
So sánh
P1=(-0,25).\(\dfrac{4}{17}\).(\(-3\dfrac{5}{21}\))(\(-\dfrac{7}{23}\))
P2=(\(-\dfrac{23}{29}\))(\(\dfrac{-15}{27}\)).0,125.\(3\dfrac{1}{5}\)
P3=\(\dfrac{-5}{13}.\dfrac{-4}{13}.\dfrac{-3}{13}.....\dfrac{4}{13}.\dfrac{5}{13}\)
Tìm x biết: \(\dfrac{x+1}{9}+\dfrac{x+4}{6}+\dfrac{x+5}{5}=\dfrac{x+2}{8}+\dfrac{x+3}{7}+\dfrac{x+6}{4}\)
Tính nhanh,hợp lí
\(\dfrac{1}{12}.\dfrac{4}{33}+\dfrac{3}{4}.\dfrac{12}{99}\)
