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a) \(\frac{17}{23}.\frac{18}{16}.\frac{23}{17}-\left(-80\right)-\frac{3}{4}\)
= \(\frac{17.18.23}{23.16.17}+80-\frac{3}{4}\)
= \(\frac{9}{8}+80-\frac{3}{4}\)
= \(\frac{3}{8}+80=\frac{643}{8}\)
b) \(\frac{5}{11}.\frac{18}{29}-\frac{5}{11}.\frac{8}{29}+\frac{5}{11}.\frac{19}{29}\)
= \(\frac{5}{11}.\left(\frac{18}{29}-\frac{8}{29}+\frac{19}{29}\right)\)
= \(\frac{5}{11}.1=\frac{5}{11}\)
c) \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)
= \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).0\)
= \(0\)
\(55-\left[48-\left(23.18-23.15\right)\right]\)
\(55-\left\{48-\left[23.\left(18-15\right)\right]\right\}\)
\(55-\left\{48-69\right\}\)
\(55+21\)
\(76\)
nhóm 23 vào với nhau ta
55-{48-(23(18-15)}
55-(-21)
76
vậy biểu thức trên ra 76
\(\left(23.18\right):\left(23.2\right)=\dfrac{23.18}{23.2}=\dfrac{18}{2}=9\)
(23.18) : (23.2)= (23:23) . (18:2)= 1.9=9
`B=-23.(53+18)+53.(18+23)`
`=-23.53-23.18+53.18+53.23`
`=(53.23-23.53)+(53.18-23.18)`
`=18.(53-23)`
`=18.30`
`=540`.
\(13\frac{2}{5}-\left(\frac{18}{23}-2\frac{6}{16}\right)\)
\(=13\frac{2}{5}-\frac{18}{23}+2\frac{6}{16}\)
\(=\frac{67}{5}-\frac{18}{23}+\frac{38}{16}\)
Tính tiếp nha
\(23.18+18.\left(-23\right)\)
\(=23.18+\left(-18\right).23\)
\(=23.\left(-18+18\right)\)
\(=23.0=0\)
23.18 + 18.(-23)
= 23.18 - 23.18
= 0