Thực hiện phép tính: A=(13/5-32/9):(73/21-10/7) B=7/2+135/9:26/7-22/9:26/7 22/09/2021 Bởi Skylar Thực hiện phép tính: A=(13/5-32/9):(73/21-10/7) B=7/2+135/9:26/7-22/9:26/7
Đáp án: Giải thích các bước giải: `A=(13/5-32/9):(73/21-10/7)` `= (\frac{13.9-32.5}{5.9}) 🙁 \frac{73-10.3}{21})` `= (\frac{-43}{45}):\frac{43}{21}` `=(\frac{-43}{45}).\frac{21}{43}` `= \frac{-7}{15}` Cách 1: `B=7/2+135/9:26/7-22/9:26/7` `= 7/2 + 135/9 . 7/26 -22/9 . 7/26` `= 7/2 + \frac{105}{26} -\frac{77}{117}` `= \frac{7.117}{2.117}+ \frac{105.9}{26.9}-\frac{77.2}{117.2}` `=\frac{1610}{234}` `=\frac{805}{117}` Cách 2: `B=7/2+135/9:26/7-22/9:26/7` `= 7/2 + 135/9 . 7/26 -22/9 . 7/26` `= 7/2 + \frac{7}{26} .( 135/9 -22/9)` `= 7/2 + 7/26 . 113/9` `= 7/2 + 791/234` `= \frac{7.117}{2.117} +\frac{791}{234}` `= \frac{819}{234} +\frac{791}{234}` `= \frac{1610}{234}` `= \frac{805}{117}` Bình luận
Đáp án+Giải thích các bước giải: $\\a)A= \left(\dfrac{13}{5}-\dfrac{32}{9}\right):\left(\dfrac{73}{21}-\dfrac{10}{7}\right)\\=\left(\dfrac{117}{45}-\dfrac{160}{45}\right):\left(\dfrac{73}{21}-\dfrac{30}{21}\right)\\=\left(-\dfrac{43}{45}\right):\dfrac{43}{21}\\=\left(-\dfrac{43}{45}\right).\dfrac{21}{43}\\=-\dfrac{7}{15}$ $\\B=\dfrac{7}{2}+\dfrac{135}{9}:\dfrac{26}{7}-\dfrac{22}{9}:\dfrac{26}{7}\\=\dfrac{7}{2}+\dfrac{135}{9}.\dfrac{7}{26}-\dfrac{22}{9}.\dfrac{7}{26}\\=\dfrac{7}{2}+\dfrac{7}{26}.\left(\dfrac{139}{9}-\dfrac{22}{9}\right)\\=\dfrac{7}{2}+\dfrac{7}{26}.\dfrac{113}{9}\\=\dfrac{7}{2}+\dfrac{791}{234}\\=\dfrac{805}{117}$ Bình luận
Đáp án:
Giải thích các bước giải:
`A=(13/5-32/9):(73/21-10/7)`
`= (\frac{13.9-32.5}{5.9}) 🙁 \frac{73-10.3}{21})`
`= (\frac{-43}{45}):\frac{43}{21}`
`=(\frac{-43}{45}).\frac{21}{43}`
`= \frac{-7}{15}`
Cách 1:
`B=7/2+135/9:26/7-22/9:26/7`
`= 7/2 + 135/9 . 7/26 -22/9 . 7/26`
`= 7/2 + \frac{105}{26} -\frac{77}{117}`
`= \frac{7.117}{2.117}+ \frac{105.9}{26.9}-\frac{77.2}{117.2}`
`=\frac{1610}{234}`
`=\frac{805}{117}`
Cách 2:
`B=7/2+135/9:26/7-22/9:26/7`
`= 7/2 + 135/9 . 7/26 -22/9 . 7/26`
`= 7/2 + \frac{7}{26} .( 135/9 -22/9)`
`= 7/2 + 7/26 . 113/9`
`= 7/2 + 791/234`
`= \frac{7.117}{2.117} +\frac{791}{234}`
`= \frac{819}{234} +\frac{791}{234}`
`= \frac{1610}{234}`
`= \frac{805}{117}`
Đáp án+Giải thích các bước giải:
$\\a)A= \left(\dfrac{13}{5}-\dfrac{32}{9}\right):\left(\dfrac{73}{21}-\dfrac{10}{7}\right)\\=\left(\dfrac{117}{45}-\dfrac{160}{45}\right):\left(\dfrac{73}{21}-\dfrac{30}{21}\right)\\=\left(-\dfrac{43}{45}\right):\dfrac{43}{21}\\=\left(-\dfrac{43}{45}\right).\dfrac{21}{43}\\=-\dfrac{7}{15}$
$\\B=\dfrac{7}{2}+\dfrac{135}{9}:\dfrac{26}{7}-\dfrac{22}{9}:\dfrac{26}{7}\\=\dfrac{7}{2}+\dfrac{135}{9}.\dfrac{7}{26}-\dfrac{22}{9}.\dfrac{7}{26}\\=\dfrac{7}{2}+\dfrac{7}{26}.\left(\dfrac{139}{9}-\dfrac{22}{9}\right)\\=\dfrac{7}{2}+\dfrac{7}{26}.\dfrac{113}{9}\\=\dfrac{7}{2}+\dfrac{791}{234}\\=\dfrac{805}{117}$