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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
B=1/4.8/3.(-20).3/-8.-1/5
=[1/4.-1/5.(-20)].[8/3.3/-8]
= 1 . (-1)
= -1
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!@@
B= 0,5 .4/3 .(-10) .0,75 .7/-35
B= 1/2 .4/3 .(-10) .3/4 .(-1)/5
B= [1/2 .(-1)/5 .(-10) ] .(4/3 .3/4)
B= 1 .1
B= 1
\(\dfrac{\dfrac{1}{4}\left(4,75-\dfrac{3}{20}\right).3,2}{0,23:\dfrac{5}{8}.0,5}+\left|-0,75\right|.2\dfrac{1}{3}\)
\(=\left[\dfrac{1}{4}\left(4,75-\dfrac{3}{20}\right).3,2\right]:\left[0,23:\dfrac{5}{8}.0,5\right]+0,75.2\dfrac{1}{3}\)
\(=\left(\dfrac{1}{4}.\dfrac{23}{5}.\dfrac{16}{5}\right):\left(\dfrac{23}{100}:\dfrac{5}{8}.\dfrac{1}{2}\right)+\dfrac{3}{8}\)
\(=\dfrac{92}{25}:\dfrac{23}{125}+\dfrac{3}{8}=20+\dfrac{3}{8}=\dfrac{163}{8}\)
35.13+35.17+65.75-65.45
=35.(13+17)+65.(75-45)
=35.30+65.30
=30.(35+65)
=30.100
=3000