tính nhanh:
17/23.8/6.23/17.(-80).3/4
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\(\frac{17.8.23.\left(-80\right).3}{23.16.17.4}=\frac{8.\left(-80\right).3}{16.4.17}=\frac{1.\left(-20\right).3}{2.1.17}=\frac{\left(-10\right).3}{1.17}=\frac{-30}{17}=-1\frac{13}{17}\)
a) \(17+188+183=205+183=388\)
b) \(80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left(130-64\right)\)
\(80-66=14\)
c) \(2^3.17-2^3.14\)
\(8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3=24\)
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) \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)
= \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).0\)
= \(0\)
- 1/4+17/50 +31/100=25/100+34/100+31/100 =90/100=0,9
- 3/4 +15/40+69/300=0,75+0,375+0,23=1,355
- 42/700+45/120+17/80=0,06+0,375+0,2125 = 0,6475
k cho mk vs
\(\frac{17}{23}.\frac{8}{6}.\frac{23}{17}.\left(-80\right).\frac{3}{4}\)
\(=\left(\frac{17}{23}.\frac{23}{17}\right).\left(\frac{8}{6}.\frac{3}{4}\right).\left(-80\right)\)
\(=1.1.\left(-80\right)\)
\(=-80\)
\(\frac{17}{23}\times\frac{8}{6}\times\frac{23}{17}\times\left(-80\right)\times\frac{3}{4}\)
\(=\left(\frac{17}{23}\times\frac{23}{17}\right)\times\left(\frac{8}{6}\times\frac{3}{4}\right)\times\left(-80\right)\)
\(=1\times1\times\left(-80\right)\)
\(=-80\)