Tính hợp lí nếu có thể
-5/7 + -3/-5 + 5/7
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-2/5 - 3/7 + 10/7 - - 7/5
= ( -2/5 -- 7/5 ) + ( -3/7 + 10/7 )
= ( -2/5 + 7/5 ) + 7/7
= 5/5 + 7/7
= 1 + 1
= 2
Tk mk nha !!!
\(=\dfrac{-3}{5}:\dfrac{7}{5}-\dfrac{3}{5}:\dfrac{7}{5}+2\dfrac{3}{5}\)
\(=-\dfrac{6}{5}\times\dfrac{5}{7}+\dfrac{13}{5}=\dfrac{61}{35}\)
\(-\frac{3}{5}.\frac{11}{7}+\frac{3}{-5}.\frac{4}{7}+\frac{23}{7}\)
\(=\frac{-3}{5}\left(\frac{11}{7}+\frac{4}{7}\right)+\frac{23}{7}\)
\(=\frac{-3}{5}.\frac{15}{7}+\frac{23}{7}\)
\(=\frac{-9}{7}+\frac{23}{7}=2\)
\(\left(\dfrac{1}{3}-\dfrac{3}{10}\right):\dfrac{3}{5}+\left(\dfrac{2}{3}-\dfrac{7}{10}\right):\dfrac{3}{5}\)
\(=\left(\dfrac{1.10}{3.10}-\dfrac{3.3}{10.3}\right).\dfrac{5}{3}+\left(\dfrac{2.10}{3.10}-\dfrac{7.3}{10.3}\right).\dfrac{5}{3}\)
\(=\left(\dfrac{10}{30}-\dfrac{9}{30}\right).\dfrac{5}{3}+\left(\dfrac{20}{30}-\dfrac{21}{30}\right).\dfrac{5}{3}\)
\(=\dfrac{1}{30}.\dfrac{5}{3}-\dfrac{1}{30}.\dfrac{5}{3}\)
\(=\dfrac{5}{3}.\left(\dfrac{1}{30}-\dfrac{1}{30}\right)\)
\(=\dfrac{5}{3}.0\)
\(=0\)
6/7+(5/8-3/16):5.-4
=6/7+(10/16-3/16):5.-4
=6/7+7/16:5.-4
=6/7+7/80.-4
=6/7+-28/80
=6/7+7/20
120/140+49/140
=169/140
Dãy trên có số số hạng là:
(2025−1)÷2+1=1013(2025−1)÷2+1=1013
Tổng của dãy số trên là:
(2025+1).1013÷2=1026169(2025+1).1013÷2=1026169
Đáp số: 10261691026169
mong bạn tick cho mik
Dãy trên có số số hạng là:
(2025−1)÷2+1=1013(2025−1)÷2+1=1013
Tổng của dãy số trên là:
(2025+1).1013÷2=1026169(2025+1).1013÷2=1026169
Đáp số: 10261691026169
mong bạn tick cho mik
\(=\dfrac{7}{11}\left(\dfrac{5}{13}+\dfrac{8}{13}\right)-3-\dfrac{7}{11}=-3\)
\(\dfrac{5}{3}\cdot\dfrac{7}{25}+\dfrac{5}{3}\cdot\dfrac{21}{25}-\dfrac{5}{3}\cdot\dfrac{7}{25}\)
\(=\dfrac{5}{3}\cdot\left(\dfrac{7.}{25}+\dfrac{21}{25}-\dfrac{7}{25}\right)\)
\(=\dfrac{5}{3}\cdot\dfrac{21}{25}=\dfrac{7}{5}\)
b) \(250\%+19\dfrac{3}{11}\cdot\dfrac{7}{26}-6\dfrac{3}{11}\cdot\dfrac{7}{26}\)
\(=\dfrac{5}{2}+\dfrac{212}{11}\cdot\dfrac{7}{26}-\dfrac{69}{11}\cdot\dfrac{7}{26}\)
\(=\dfrac{7}{26}\cdot\left(\dfrac{212}{11}-\dfrac{69}{11}\right)+\dfrac{5}{2}\)
\(=\dfrac{7}{26}\cdot13+\dfrac{5}{2}\)
\(=\dfrac{7}{2}+\dfrac{5}{2}\)
\(=\dfrac{12}{2}=6\)
\(\frac{-5}{7}+\frac{-3}{-5}+\frac{5}{7}\)
\(=\left(\frac{-5}{7}+\frac{5}{7}\right)+\frac{-3}{-5}\)
\(=0+\frac{-3}{-5}\)
\(=\frac{-3}{-5}\)
-5/7 + -3/-5 + 5/7
= ( -5/7 + 5/7 ) + -3/-5
= 0 + -3/-5
= -3/-5
= 3/5