13/37 . 5/12 – 7/37 . 13/6|+ -1/37 . 13/4 18 và 13/15 – 36 và 29/30 + 19 và 1/10 16/10/2021 Bởi Isabelle 13/37 . 5/12 – 7/37 . 13/6|+ -1/37 . 13/4 18 và 13/15 – 36 và 29/30 + 19 và 1/10
Đáp án: $a)\dfrac{-13}{37}\\b)1$ Giải thích các bước giải: $a)\dfrac{13}{37}.\dfrac{5}{12}-\dfrac{7}{37}.\dfrac{13}{6}+\dfrac{-1}{37}.\dfrac{13}{4}\\=\dfrac{13}{37}.\left ( \dfrac{5}{12}-\dfrac{7}{6}-\dfrac{1}{4} \right )\\=\dfrac{13}{37}.\left ( \dfrac{5}{12}-\dfrac{14}{12}-\dfrac{3}{12} \right )\\=\dfrac{13}{37}.\dfrac{-12}{12}\\=\dfrac{-13}{37}\\b)18\dfrac{13}{15}-36\dfrac{29}{30}+19\dfrac{1}{10}\\=\dfrac{18.15+13}{15}-\dfrac{36.30+29}{30}+\dfrac{19.10+1}{10}\\=\dfrac{283}{15}-\dfrac{1109}{30}+\dfrac{191}{10}\\=\dfrac{283.2}{30}-\dfrac{1109}{30}+\dfrac{191.3}{30}\\=\dfrac{30}{30}\\=1$ Bình luận
`a) 13/37 . 5/12 – 7/37 . 13/6 + (-1/37) . 13/4` `= 13/37 . 5/12 – 13/37 . 7/6 + 13/37 . (-1/4)` `= 13/37 . [5/12 – 7/6 + (-1/4)]` `= 13/37 . (-1)` `= -13/37.` `b) 18 13/15 – 36 29/30 + 19 1/10` `= (18 – 36 + 19) + (13/15 – 29/30 + 1/10)` `= 1 + 0` `= 1.` Bình luận
Đáp án:
$a)\dfrac{-13}{37}\\
b)
1$
Giải thích các bước giải:
$a)\dfrac{13}{37}.\dfrac{5}{12}-\dfrac{7}{37}.\dfrac{13}{6}+\dfrac{-1}{37}.\dfrac{13}{4}\\
=\dfrac{13}{37}.\left ( \dfrac{5}{12}-\dfrac{7}{6}-\dfrac{1}{4} \right )\\
=\dfrac{13}{37}.\left ( \dfrac{5}{12}-\dfrac{14}{12}-\dfrac{3}{12} \right )\\
=\dfrac{13}{37}.\dfrac{-12}{12}\\
=\dfrac{-13}{37}\\
b)
18\dfrac{13}{15}-36\dfrac{29}{30}+19\dfrac{1}{10}\\
=\dfrac{18.15+13}{15}-\dfrac{36.30+29}{30}+\dfrac{19.10+1}{10}\\
=\dfrac{283}{15}-\dfrac{1109}{30}+\dfrac{191}{10}\\
=\dfrac{283.2}{30}-\dfrac{1109}{30}+\dfrac{191.3}{30}\\
=\dfrac{30}{30}\\
=1$
`a) 13/37 . 5/12 – 7/37 . 13/6 + (-1/37) . 13/4`
`= 13/37 . 5/12 – 13/37 . 7/6 + 13/37 . (-1/4)`
`= 13/37 . [5/12 – 7/6 + (-1/4)]`
`= 13/37 . (-1)`
`= -13/37.`
`b) 18 13/15 – 36 29/30 + 19 1/10`
`= (18 – 36 + 19) + (13/15 – 29/30 + 1/10)`
`= 1 + 0`
`= 1.`