(28 + 83):(25.23)
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\(\left(\frac{2}{8}+\frac{8}{3}\right):\left(\frac{2}{5}.\frac{2}{3}\right)=\frac{35}{12}.\frac{5.3}{2.2}\)
\(=\frac{35.5.3}{3.4.4}=\frac{35.5}{16}=\frac{175}{16}.\)
\(\left(2^8+8^3\right):\left(2^5.2^3\right)\)
\(=\left(2^8+2^9\right):2^8\)
\(=2^8\left(1+2\right):2^8\)
=3
hok tốt
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a) 71995.(72-1):71995=72-1=49-1=48
b) [28+(23)3]:25+3=(28+29):28=28(1+2):28=1+2=3
gíp mình bài này với chứng minh rằng A=1/10.(7^2004^2006 -3^92^94)
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a) 8.(-5).(-4).2 = 8.20.2 = 8.40 = 320
b) \(1\frac{3}{7}+\left(-\frac{1}{3}+2\frac{4}{7}\right)\)
\(=1\frac{3}{7}-\frac{1}{3}+2\frac{4}{7}\)
\(=\left(1\frac{3}{7}+2\frac{4}{7}\right)-\frac{1}{3}=\left(1+2\right)+\left(\frac{3}{7}+\frac{4}{7}\right)-\frac{1}{3}=4-\frac{1}{3}=\frac{11}{3}\)
c) \(\frac{8}{5}\cdot\frac{-2}{3}+\frac{-5\cdot5}{3\cdot5}\)
\(=\frac{8}{5}\cdot\frac{-2}{3}+\frac{-25}{15}=\frac{-16}{15}+\frac{-25}{15}=\frac{-41}{15}\)
d) \(\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}\left(-2\right)^2=\frac{6}{7}+\frac{5}{8}\cdot\frac{1}{5}-\frac{3}{16}\cdot4\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}=\frac{13}{56}\)
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\(a,25+3\left(x-8\right)=106\\ 3\left(x-8\right)=81\\ x-8=27\\ x=35\)
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c) 125:5^3
=125:125
=1
mik chỉ làm đc câu c thôi nha
= [ 28 + (23)3 ] : 28
= 28 : 28 + 29 : 28
= 1 + 2
= 3