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\(0,5.\left[\frac{4}{3}.\left(-20\right)\right].0,75.\frac{8}{-35}\)
\(\frac{5}{10}.\left[\frac{4}{3}.\left(-20\right)\right].\frac{75}{100}.\frac{8}{-35}\)
\(=\frac{2}{5}.\left[\frac{4}{3}.\left(-20\right)\right].\frac{3}{4}.\frac{8}{-35}\)
\(=\left(\frac{4}{3}.\frac{3}{4}\right).\left[\frac{2}{5}.\frac{\left(-35\right)}{8}\right].\left(-20\right)\)
\(=1.\left(\frac{2}{1}.\frac{1}{4}\right).\left(-20\right)\)
\(=1.\frac{1}{2}.\left(-20\right)=-\frac{20}{2}=\frac{10}{1}=10\)
Mk ko chắc, bn tham khảo nha
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B=1/4.8/3.(-20).3/-8.-1/5
=[1/4.-1/5.(-20)].[8/3.3/-8]
= 1 . (-1)
= -1
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\(\left(\dfrac{35}{100}-\dfrac{3}{20}\right)\times4-\dfrac{8}{5}\times\dfrac{3}{4}=\dfrac{1}{5}\times4-\dfrac{8}{5}\times\dfrac{3}{4}=\dfrac{4}{5}-\dfrac{6}{5}=-\dfrac{2}{5}\)
\(\left(35\%-\dfrac{3}{20}\right):\left(\dfrac{1}{2}\right)^2-1\dfrac{3}{5}\cdot0,75=\left(\dfrac{7}{20}-\dfrac{3}{20}\right):\dfrac{1}{4}-\dfrac{8}{5}\cdot\dfrac{3}{4}=\dfrac{4}{20}\cdot4-\dfrac{8}{5}\cdot\dfrac{3}{4}=\dfrac{1}{5}\cdot4-\dfrac{8}{5}\cdot\dfrac{3}{4}=\dfrac{4}{5}-\dfrac{6}{5}=-\dfrac{2}{5}\)
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= 4/9 : -8 - (-1/4 + 9/20) : 14/5
= 4/9 : -8 - 1/5 : 14/5
= -1/18 - 1/5 : 14/5
= -1/18 - 1/14
= -8/63
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1) 3.(-4)2+2.(-5)-20
= 3.16+(-10)-20
= 48+(-10)-20
= 38-20
= 18
2) 5.(-3)2-14.(-8)+(-40)
= 5.9-(-112)+(-40)
= 45-(-112)+(-40)
= 157+(-40)
= 117
3) 31-[26-(209+35)]
= 31-[26-244]
= 31-[-218]
= 249
Tk mk nhé!Thank you very much!
mk làm câu 3 nha!!!
\(31-\left[26-\left(209+35\right)\right]\)
\(=31-\left[26-209-35\right]\)
\(=31-26+209+35\)
\(=\left(31+209\right)+\left(-26+35\right)\)
\(=240+9\)
\(=249\)
chúc bn học giỏi!@@
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1) 125.(-24) + 24.225.
\(=24\left(-125+225\right)=24.100=2400.\)
2) 512.(2 – 128) – 128. (-512).
\(=512\left(2-128+128\right)=512.2=1024.\)