tinhs giá trị biểu thức
1/5x6 + 7/6 - 6/5 =
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a: \(=\dfrac{1}{2}\cdot\dfrac{3}{4}\cdot\dfrac{5}{6}=\dfrac{15}{48}=\dfrac{5}{16}\)
b: \(=\dfrac{2}{3}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{20}{21}\)
c: \(=\dfrac{24}{5}\cdot\dfrac{5}{12}=2\)
d: \(=\dfrac{1}{9}+\dfrac{3}{4}=\dfrac{4+27}{36}=\dfrac{31}{36}\)
1: \(=\dfrac{3}{8}\cdot\dfrac{5}{6}=\dfrac{15}{24}=\dfrac{5}{8}\)
2: \(=\dfrac{2}{3}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14+6}{21}=\dfrac{20}{21}\)
3: \(=\dfrac{24}{5}\cdot\dfrac{5}{12}=2\)
4: \(=\dfrac{1}{3}+\dfrac{3}{4}=\dfrac{4+9}{12}=\dfrac{13}{12}\)
`1/2 + 1/6 + 1/12 +1/20 + 1/30 + 1/42`
`=1/(1.2) + 1/(2.3) + 1/(3.4) + 1/(4.5) + 1/(5.6) + 1/(6.7)`
`=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7`
`=1-1/7`
`=6/7`
\(a,\dfrac{1}{2}:\dfrac{2}{4}:5\) -> chỉ có phép chia nên thực hiện từ trái sang phải :>
\(=1:5=\dfrac{1}{5}\)
\(b,\dfrac{2}{5}:12:\dfrac{4}{3}\) -> tương tự câu thứ nhất :>
\(=\dfrac{1}{30}:\dfrac{4}{3}=\dfrac{1}{40}\)
1)
\(\dfrac{1}{2}:\dfrac{2}{4}:\dfrac{5}{1}=\left(\dfrac{1}{2}.\dfrac{4}{2}\right).\dfrac{1}{5}=1.\dfrac{1}{5}=\dfrac{1}{5}\)
dấu chấm là dấu nhân á .
2)
\(\dfrac{2}{5}:\dfrac{12}{1}:\dfrac{4}{3}=\left(\dfrac{2}{5}.\dfrac{1}{12}\right).\dfrac{3}{4}=\dfrac{1}{30}.\dfrac{3}{4}=\dfrac{3}{120}=\dfrac{1}{40}\)
\(\dfrac{1}{3}\times\dfrac{16}{1}:\dfrac{8}{3}=\left(\dfrac{1}{3}\times\dfrac{16}{1}\right):\dfrac{8}{3}=\dfrac{16}{3}:\dfrac{8}{3}=\dfrac{16}{3}\times\dfrac{3}{8}=\dfrac{48}{24}=2\)
1/5 x 6 +7/6-6/5
=1/30+7/6-6/5
=1/30+35/30-36/30
=0/30
=0
1/5x6 + 7/6 - 6/5 = 1/30 + 7/6 - 6/5
= 1/30 + 35/30 - 36/30
= 36/30 - 36/30
=0/30 = 0