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\(\left|x\right|-3=4\)

\(\Rightarrow\left|x\right|=4+3\)

\(\Rightarrow\left|x\right|=7\)

\(\Rightarrow x\in\left\{-7;7\right\}\)

\(\frac{10^3+2.5^3+5^3}{55}=\frac{2^3.5^3+5^3\left(1+2\right)}{5.11}=\frac{8.5^3+5^3.3}{5.11}=\frac{5^3\left(8+3\right)}{5.11}\)

\(=\frac{5^3.11}{5.11}=\frac{5^3}{5}=5^2=25\)

30 tháng 12 2018

Bài 1 :

\(\left|x\right|-3=4\)

\(\left|x\right|=7\)

\(\Rightarrow\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)

Vậy...

Bài 2 :

\(\frac{10^3+2\cdot5^3+5^3}{55}\)

\(=\frac{2^3\cdot5^3+2\cdot5^3+5^3}{5\cdot11}\)

\(=\frac{5^3\cdot\left(2^3+2+1\right)}{5\cdot11}\)

\(=\frac{5^3\cdot11}{5\cdot11}\)

\(=5^2\)

27 tháng 11 2019

Lần sau bạn nên viết đề rõ hơn nhé!

Đề: Tính nhanh: \(\frac{10^3+2\cdot5^3+5^3}{55}\)

ta có: \(\frac{10^3+2\cdot5^3+5^3}{55}=\frac{5^3\left(2^3+2+1\right)}{5\cdot11}=\frac{5^3\cdot11}{5\cdot11}=5^2=25\)

Học tốt nhé ^3^

27 tháng 11 2019

Ta có : \(\frac{10^3+2.5^3+5^3}{55}=\frac{2^3.5^3+2.5^3+5^3}{5.11}=\frac{5^3\left(2^3+2+1\right)}{5.11}=\)\(\frac{5^3.11}{5.11}=5^2=25\)

Vậy \(\frac{10^3+2.5^3+5^3}{5.11}\)=25.

19 tháng 12 2018

a)\(\frac{10^3+2.5^3+5^3}{55}\)=\(\frac{5^3.2^3+2.5^3+5^3}{5.11}\)=\(\frac{5^3.\left(2^3+2+1\right)}{5.11}\)=\(5^2\)=\(25\)

b) \(2^x+2^{x+3}=144\)

\(\Rightarrow2^x+2^x.2^3=144\)

\(\Rightarrow2^x.\left(1+2^3\right)=144\)

\(\Rightarrow2^x=16=2^4\)

\(\Rightarrow x=4\)

c) \(2\left(x-5\right)+3\left(x-7\right)=10\)

\(\Rightarrow2x-10+3x-21=10\)

\(\Rightarrow5x-31=10\)

\(\Rightarrow5x=41\)

\(\Rightarrow x=\frac{41}{5}=8,2\)

11 tháng 12 2018

\(\frac{10^3+2.5^3+5^3}{55}-\frac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)\(=\frac{2^3.5^3+2.5^3+5^3}{5.11}-\frac{2^{12}.3^{10}+2^9.3^9.2^3.3.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)

\(=\frac{5^3\left(2^3+2+1\right)}{5.11}-\frac{2^{12}.3^{10}.\left(1+5\right)}{2^{11}.3^{11}.\left(2.3-1\right)}=\frac{5^2.11}{11}-\frac{2.6}{3.5}=25-\frac{4}{5}=\frac{121}{5}\)

11 tháng 12 2015

\(\frac{10^3+2\cdot5^3+5^3}{55}\)

\(=\frac{\left(5.2\right)^3+5^3\cdot\left(2+1\right)}{55}\)

\(=\frac{5^3\cdot2^3+5^3\cdot3}{55}\)

\(=\frac{5^3\cdot8+5^3\cdot3}{55}\)

\(=\frac{5^3\cdot\left(8+3\right)}{55}\)

\(=\frac{5^3\cdot11}{55}=\frac{5^3}{5}=5^2=25\)

Tick nha

a) \(\frac{1}{12}+\frac{3}{15}+\frac{11}{12}+\frac{1}{71}-\frac{12}{10}=\left(\frac{1}{12}+\frac{11}{12}\right)+\left(\frac{1}{5}-\frac{1}{5}\right)+\frac{1}{71}\)

\(=\frac{12}{12}+0+\frac{1}{71}=1+\frac{1}{71}=1\frac{1}{71}=\frac{72}{71}\)

b) \(\frac{2}{3}-4\left(\frac{1}{2}+\frac{3}{4}\right)=\frac{2}{3}-4.\frac{5}{4}=\frac{2}{3}-5=\frac{2}{3}-\frac{15}{3}=-\frac{13}{3}\)

c) \(\frac{-4}{13}.\frac{3}{17}+\frac{-12}{13}.\frac{4}{7}+\frac{4}{13}=\frac{4}{13}.\frac{-3}{17}+\frac{4}{13}.\frac{-12}{17}+\frac{4}{13}.1\)

\(=\frac{4}{13}\left(\frac{-3}{17}+\frac{-12}{17}+1\right)=\frac{4}{13}\left(\frac{-15}{17}+\frac{17}{17}\right)=\frac{4}{13}.\frac{2}{17}=\frac{8}{221}\)

d) \(\frac{10^3+2.5+5^3}{55}=\frac{1000+10+125}{55}=\frac{1135}{55}=\frac{227}{11}\)

23 tháng 3 2020

\(\frac{10^3+2.5^3+5^3}{55}\)

\(=\frac{\left(2.5\right)^3+2.5^3+5^3}{5.11}\)

=\(\frac{2^3.5^3+2.5^3+5^3}{5.11}\)

=\(\frac{5^3.\left(2^3+2+1\right)}{5.11}\)

=\(\frac{5^3.\left(8+2+1\right)}{5.11}\)

=\(\frac{5^3.11}{5.11}\)

=\(5^2\)

=25

Chúc bn học tốt !