\(=\frac{-2^2.3^8.-\frac{1}{8}-\frac{1}{4}.\left(2.3\right)^9}{2^9.3^6+\left(2.3\right)^6.2^3.5}\)
\(=\frac{-2301}{2048}\)
tìm x biết
a)
\(\frac{1}{2}\)+\(\frac{2}{3}\).x=\(\frac{4}{5}\)
b)
x+\(\frac{1}{4}\)=\(\frac{4}{3}\)|
c)
\(\frac{3}{5}x-\frac{1}{2}=-\frac{1}{7}\)
|d)
\(\left|x+5\right|-6=9\)
e)
\(\left|x-\frac{4}{5}\right|=\frac{3}{4}\)
f)
\(\frac{1}{2}-\left|x\right|=\frac{1}{3}\)
g)
\(^{x^2}\)=16
h)
\(\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\)
i)
\(^{3^3}\).x=\(^{3^6}\)
j)
\(\frac{1,35}{0,2}=\frac{1,25}{x}\)
k)
\(1\frac{2}{3}:x=6:0,3\)
bài2
a, x+\(\frac{1}{6}=\frac{-3}{8}\)
b, \(\left[\frac{9}{2}-2x\right]\).\(\left[-1\frac{4}{7}\right]\)=\(\frac{11}{14}\)
Câu 1: Chứng minh rằng:
\(\frac{1}{3^2}\)+\(\frac{1}{4^2}\)+\(\frac{1}{5^2}\)+\(\frac{1}{6^2}\).....+\(\frac{1}{100^2}\)<\(\frac{1}{2}\)
Câu 2: Rút gọn biểu thức:
A=\(\left(\frac{1}{2}+1\right)\).\(\left(\frac{1}{3}+1\right)\).\(\left(\frac{1}{4}+ 1\right)\)....\(\left(\frac{1}{98}+1\right)\).\(\left(\frac{1}{99}+1\right)\)
\(Mn giúp êm với ạ\) ω
Mơn mn nhìu❤
tìm x biết \(\frac{2}{3}x:\frac{1}{5}=1\frac{1}{5}:25\%\)
Tìm x\(\varepsilon\)biết \(\frac{4}{3}.\left(\frac{1}{6}-\frac{1}{2}\right)\)<x<\(\frac{2}{3}\).\(\left(\frac{-1}{6}+\frac{3}{4}\right)\)
bài 1
a, \(\frac{-3}{7}\)-\(\left\{\frac{2}{3}-\frac{3}{7}\right\}\) b,\(\frac{2}{15}:\left[\frac{1}{3}.\frac{4}{5}-\frac{1}{3}.\frac{6}{5}\right]\)
bài 1
a, 27 + 46 + 68 + 54 +73
b,2016 - ( 2016 -2017)
c, \(\frac{2}{3}+\frac{1}{3}.\left(\frac{-4}{9}+\frac{5}{6}\right):\frac{7}{12}\)
Tính nhanh ( nếu có thể):
\(a,-3^2+\left\{-52:[\left(-3\right)^2\right\}\) \(d,(\frac{377}{-231}-\frac{123}{89}+\frac{34}{791}):(\frac{1}{6}-\frac{1}{8}-\frac{1}{24})\)
\(b,2\frac{3}{7}+(\frac{2}{9}-1\frac{3}{7})-\frac{5}{3}:\frac{1}{9}\) \(e,\frac{-5}{13}:\frac{3}{7}-\frac{2}{7}.\frac{8}{13}+\frac{5}{13}.\frac{1}{7}\)
\(c,\frac{-11}{23}.\frac{6}{7}+\frac{8}{7}.\frac{-11}{23}-\frac{1}{23}\)
1/ \(\left(\frac{7}{8}-\frac{3}{4}\right).1\frac{1}{3}-\frac{2}{7}.\left(3,5\right)^2\)
2/\(1,25:\left(10,3-9,8\right)-\frac{3}{4}\)
1. tính nhanh
a) \(15\frac{3}{13}-\left(3\frac{4}{7}+8\frac{3}{13}\right)\)
b) \(\left(7\frac{4}{9}+4\frac{7}{11}\right)-3\frac{1}{2}\)
c) \(\frac{-7}{9}\times\frac{4}{11}+\frac{-7}{9}\times\frac{7}{11}+5\frac{7}{9}\)
