15/24+2
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\(\text{35 + (–47) – |–12|}\)
\(=-12-12\)
\(=-24\)
\(\text{(–15) – 70 : (–14) + (–32) . (–2)}\)
\(=-15+5+64\)
\(=-10+64\)
\(=54\)
\(\text{ 15 – 12 . (-3)^2 – 135 : |–15|}\)
\(=15-12.9-135:15\)
\(=15-108-9\)
\(=-102\)
Tính hợp lý:
\(\text{ –24 . 78 + 24(–35) – 24(–13)}\)
\(=24.\left(-78+\left(-35\right)-\left(-13\right)\right)\)
\(=24.\left(-100\right)\)
\(=-2400\)
học tốt
\(\frac{17}{8}+\frac{28}{15}-\frac{8}{15}=\frac{17}{8}+\frac{4}{3}=\frac{83}{24}=3\frac{11}{24}\)
=> chọn a
\(\frac{1}{9\cdot10}+\frac{2}{10\cdot12}+\frac{3}{12\cdot15}+\frac{4}{15\cdot19}+\frac{5}{19\cdot24}+\frac{6}{24\cdot30}
\)
\(=\frac{1}{9}-\frac{1}{10}+\frac{1}{10}-\frac{1}{12}+\frac{1}{12}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}+\frac{1}{19}-\frac{1}{24}+\frac{1}{24}-\frac{1}{30}\)
\(=\frac{1}{9}-\frac{1}{30}\)
\(=\frac{10}{90}-\frac{3}{90}\)
\(=\frac{7}{90}\)
\(\frac{15}{24}-\frac{2}{15}=\frac{5}{8}-\frac{2}{15}=\frac{75}{120}-\frac{16}{120}=\frac{59}{120}\)
Ư(-24) = {-24,-12,-8,-6,-4,-3,-2,-1,1,2,3,4,6,8,12,24}
B(-24) = {0.+-24,+-48,...}
ƯC(-15,20) = {1,5,-1,-5}
\(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\left(\dfrac{4}{5}-2-\dfrac{4}{15}\right):\dfrac{47}{24}\)
\(=\dfrac{3}{4}-\dfrac{22}{15}\cdot\dfrac{24}{47}=\dfrac{1}{940}\)
5/4
\(\dfrac{15}{24}+2=\dfrac{15}{24}+\dfrac{48}{24}=\dfrac{63}{24}=\dfrac{21}{8}\)