Tính nhanh:
15 - 15/7 - 15/12 / 3 - 3/7 - 3/12
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\(\frac{15-\frac{15}{7}-\frac{15}{12}}{3-\frac{3}{7}-\frac{3}{12}}\)
= \(\frac{15.\left(1-\frac{1}{7}-\frac{1}{12}\right)}{3.\left(1-\frac{1}{7}-\frac{1}{12}\right)}\)
= \(\frac{15}{3}\)
= 5
https://vn.answers.yahoo.com/question/index?qid=20100907070553AAEawEd
lời giải rõ ràng rồi đó bạn ^_~
\(\frac{15-\frac{15}{7}-\frac{15}{12}}{3-\frac{3}{7}-\frac{3}{12}}\)
\(=\frac{15\left(1-\frac{1}{7}-\frac{1}{12}\right)}{3\left(1-\frac{1}{7}-\frac{1}{12}\right)}\)
\(=\frac{15}{3}\)
K nha
\(15-\frac{15}{7}-\frac{15}{12}=11\frac{17}{28}\)
\(=\frac{325}{28}\)
\(3-\frac{3}{7}-\frac{3}{13}=2\frac{31}{91}\)
\(=\frac{213}{91}\)
a ) ( -1/6 + 5/12 ) + 7/12
= -1/6 + ( 5/12 + 7/12 )
= -1/6 + 12/12
= -2/12 + 12/12
= -10/12
= -5/6
\(\dfrac{3}{5}.\dfrac{5}{7}+\dfrac{12}{20}.\dfrac{2}{14}+\dfrac{9}{15}.\dfrac{1}{7}\)
\(=\dfrac{3}{7}+\dfrac{3}{35}+\dfrac{3}{35}\)
\(=\dfrac{3}{7}+\dfrac{6}{35}\)
\(=\dfrac{15}{35}+\dfrac{6}{35}\)
\(=\dfrac{21}{35}\)
\(=\dfrac{3}{5}\)
...=-15-9=-24
...=4+7=11
...=-12-13=-25
...=13+10=23
...=-4-7=-11
...=-9+13=4
...=12+0=12
...=0-7=-7
...=0+3=3
...=15-17=-2
...=-6
...=-23
...=15-15=0
15-\(\frac{15}{7}\)-\(\frac{15}{12}\)
3-\(\frac{3}{7}\)-\(\frac{3}{12}\)
=15.[1-\(\frac{1}{7}\)-\(\frac{1}{12}\)]
3.[1-\(\frac{1}{7}\)-\(\frac{1}{12}\)]
=\(\frac{15}{3}\)=5
15/3 = 5 nha