3,2. 15/64 - ( 4/5+2/5 ) : 3 và 2/3
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bài 1 : so sánh
3.2 . 15 / 64 - ( 4/5 + 2/5 ) =
3.2 . 15 / 64 - 6/5 =
3/ 4 - 6/ 5 = -9/20
vì -9/ 20 < 0
2/3 > 0
theo tính chất bắc cầu ta có : 2/ 3 > - 9 / 20
\(\dfrac{-3}{2}\times\dfrac{-15}{64}+\left(0,8-2\dfrac{4}{5}\right):3\dfrac{2}{3}\\ =\dfrac{45}{128}+\left(-2\right)\times\dfrac{3}{11}\\ =\dfrac{45}{128}-\dfrac{6}{11}\\ =-\dfrac{273}{1408}\)
\(=\frac{16}{5}.\frac{-15}{64}-\left(\frac{4}{5}+\frac{2}{3}\right):3\frac{2}{3}=\frac{16}{5}.\frac{-15}{64}+\frac{-22}{15}:\frac{11}{3}=\frac{-3}{4}+\frac{-2}{5}=\frac{-23}{20}\)
/ là phân số
1.=6/7.8/13+6/7.9/13-3/13.6/7=6/7.(8/13+9/13-3/13)=6/7.14/13=12/13
a: \(=\left(15-6-\dfrac{13}{18}\right):\dfrac{298}{27}-\dfrac{17}{8}:\dfrac{51}{40}\)
\(=\dfrac{149}{18}\cdot\dfrac{27}{298}-\dfrac{5}{3}=\dfrac{3}{2}-\dfrac{5}{3}=\dfrac{9-10}{6}=\dfrac{-1}{6}\)
b: \(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\dfrac{-22}{15}:\dfrac{11}{2}\)
\(=\dfrac{3}{4}-\dfrac{4}{15}=\dfrac{29}{60}\)
c: \(=\dfrac{-7}{9}\left(\dfrac{4}{11}+\dfrac{7}{11}\right)+5+\dfrac{7}{9}=\dfrac{-7}{9}+\dfrac{7}{9}+5=5\)
d: \(=\dfrac{1}{2}\cdot\dfrac{4}{3}\cdot10\cdot\dfrac{1}{5}\cdot\dfrac{3}{4}=1\)
e: \(=\dfrac{4}{25}+\dfrac{11}{2}\cdot\dfrac{5}{2}+\dfrac{-23}{4}=\dfrac{204}{25}\)
\(\left(-3,2\right).\left(-\dfrac{15}{64}\right)+\left(80\%-2\dfrac{4}{15}\right):3\dfrac{2}{3}=-\dfrac{16}{5}.\left(-\dfrac{15}{64}\right)+\left(\dfrac{4}{5}-\dfrac{34}{15}\right):\dfrac{11}{3}=-\dfrac{16}{5}.\left(-\dfrac{15}{64}\right)+\dfrac{46}{15}:\dfrac{11}{3}=\dfrac{3}{4}+\dfrac{46}{55}=\dfrac{349}{220}\)