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`17/13-14/23+9/13-9/23`
`=(17/13+9/13)-(14/23+9/23)`
`=26/13-23/23`
`=2-1`
`=1`
đáp án là :
[17/13+9/13] + [ 14/23-9/23]
= 26/ 13 - 23/23
=2-1=1
cgúc bạn học tốt
\(a.=\left(\dfrac{4}{5}.\dfrac{5}{6}\right).\dfrac{2}{3}=\dfrac{4}{6}.\dfrac{2}{3}=\dfrac{4}{9}\)
\(b.\dfrac{4}{5}.\dfrac{3}{4}+\dfrac{5}{4}.\dfrac{3}{4}=\dfrac{3}{5}+\dfrac{15}{16}=\dfrac{123}{80}\)
\(c.\left(\dfrac{11}{23}+\dfrac{9}{23}\right)+\left(\dfrac{2}{23}+\dfrac{18}{23}\right)=\dfrac{20}{23}+\dfrac{20}{23}=\dfrac{40}{23}\)
\(d.\left(\dfrac{27}{12}-\dfrac{25}{36}\right)+\left(\dfrac{17}{6}-\dfrac{15}{6}\right)=\dfrac{14}{9}+\dfrac{1}{3}=\dfrac{17}{9}\)
a,
23 x (7 - 4) = 23 x 3 = 69
23 x 7 - 23 x 4 = 161 - 92 = 69
Ta có: 23 x (7 - 4) = 23 x 7 - 23 x 4
b,
(8 - 3) x 9 = 5 x 9 = 45
8 x 9 - 3 x 9 = 72 - 27 = 45
Ta có: (8 - 3) x 9 = 8 x 9 - 3 x 9
Ai rảnh mà làm hộ mày, ngu như con chó mới không biết làm
\(\dfrac{27}{13}-\dfrac{14}{23}+\dfrac{12}{23}-\dfrac{9}{23}\)
\(=\dfrac{27}{13}+\dfrac{-14+12-9}{23}\)
\(=\dfrac{27}{13}+\dfrac{-11}{23}\)
\(=\dfrac{478}{299}\)
a. \(\dfrac{17}{13}-\dfrac{14}{23}+\dfrac{9}{13}-\dfrac{9}{23}=\left(\dfrac{17}{13}+\dfrac{9}{13}\right)-\left(\dfrac{14}{23}+\dfrac{9}{23}\right)=\dfrac{26}{13}-\dfrac{23}{23}=2-1=1\)
b.\(\dfrac{49}{5}-\dfrac{1}{2}-\dfrac{1}{4}-\dfrac{1}{32}-\dfrac{1}{16}-\dfrac{1}{32}=\dfrac{49}{5}-\left(1-\dfrac{1}{32}\right)=\dfrac{44}{5}+\dfrac{1}{32}=\dfrac{1413}{160}\)
\(\frac{11}{23}.\frac{2}{23}+\frac{9}{23}.\frac{10}{23}=\frac{22+90}{23.23}=\frac{112}{529}\)
bang 17
bang 17 nha