sánh đi nộp bài rồi làm hộ phép tính này lười làm a) 5/12 . (-3/4) + 7/12 . (-3/4) b) |2/5 – 1/2| – 7/2 – 1/10 11/07/2021 Bởi Serenity sánh đi nộp bài rồi làm hộ phép tính này lười làm a) 5/12 . (-3/4) + 7/12 . (-3/4) b) |2/5 – 1/2| – 7/2 – 1/10
Đáp án: $a)$ $\dfrac{-3}{4}$$b)$ $\dfrac{-7}{2}$ Giải thích các bước giải:$a)$ $\dfrac{5}{12}$ $.$ $\dfrac{-3}{4}$ $+$ $\dfrac{7}{12}$ $.$ $\dfrac{-3}{4}$$=$ $\dfrac{-3}{4}$ $.$ $($ $\dfrac{5}{12}$ $+$ $\dfrac{7}{12}$ $)$$=$ $\dfrac{-3}{4}$ $.$ $1$$=$ $\dfrac{-3}{4}$$b)$ $|$ $\dfrac{2}{5}$ $-$ $\dfrac{1}{2}$ $|$ $-$ $\dfrac{7}{2}$ $-$ $\dfrac{1}{10}$$=$ $\dfrac{1}{10}$ $-$ $\dfrac{7}{2}$ $-$ $\dfrac{1}{10}$$=$ $($ $\dfrac{1}{10}$ $-$ $\dfrac{1}{10}$ $)$ $-$ $\dfrac{7}{2}$$=$ $0$ $-$ $\dfrac{7}{2}$$=$ $\dfrac{-7}{2}$$FbBinhne2k88$ Bình luận
a) `5/12 . (-3/4) + 7/12 . (-3/4)` `= -3/4 . (5/12 + 7/12)` `= -3/4 . 12/12 = -3/4 . 1 = -3/4` b) `|2/5 -1/2| – 7/2 – 1/10` `=| -1/10| – 1/10 – 7/2` `=1/10-1/10 – 7/2=-7/2` Bình luận
Đáp án:
$a)$ $\dfrac{-3}{4}$
$b)$ $\dfrac{-7}{2}$
Giải thích các bước giải:
$a)$ $\dfrac{5}{12}$ $.$ $\dfrac{-3}{4}$ $+$ $\dfrac{7}{12}$ $.$ $\dfrac{-3}{4}$
$=$ $\dfrac{-3}{4}$ $.$ $($ $\dfrac{5}{12}$ $+$ $\dfrac{7}{12}$ $)$
$=$ $\dfrac{-3}{4}$ $.$ $1$
$=$ $\dfrac{-3}{4}$
$b)$ $|$ $\dfrac{2}{5}$ $-$ $\dfrac{1}{2}$ $|$ $-$ $\dfrac{7}{2}$ $-$ $\dfrac{1}{10}$
$=$ $\dfrac{1}{10}$ $-$ $\dfrac{7}{2}$ $-$ $\dfrac{1}{10}$
$=$ $($ $\dfrac{1}{10}$ $-$ $\dfrac{1}{10}$ $)$ $-$ $\dfrac{7}{2}$
$=$ $0$ $-$ $\dfrac{7}{2}$
$=$ $\dfrac{-7}{2}$
$FbBinhne2k88$
a) `5/12 . (-3/4) + 7/12 . (-3/4)`
`= -3/4 . (5/12 + 7/12)`
`= -3/4 . 12/12 = -3/4 . 1 = -3/4`
b) `|2/5 -1/2| – 7/2 – 1/10`
`=| -1/10| – 1/10 – 7/2`
`=1/10-1/10 – 7/2=-7/2`