13/15 + 4/7 - 101/105

= 91/105 + 60/105 - 101/105

= 50/105 = 10/21

học tốt

13\15+4\7-101\105

=91\105+60\105-101\105

=151\105-101\105

=50\105

=10\21

cho ban do

cho bạn đó mình viết thiếu

10/21

\(=\dfrac{91}{105}-\dfrac{101}{105}+\dfrac{4}{7}=-\dfrac{2}{21}+\dfrac{12}{21}=\dfrac{10}{21}\)

10/21

13/5+4/7-101/105

=13.21/5.21+ 4.15/7.15-101/105

=273/105+50/105 -101/105

=222/105

232/105

\(\dfrac{13}{5}+\dfrac{4}{7}-\dfrac{101}{105}=\dfrac{273}{105}+\dfrac{60}{105}-\dfrac{101}{105}=\dfrac{232}{105}\)

Ta có: \(A=1-2+3-4+5-6+7-8+9\)

\(=(1+9)-(2+8)+(3+7)-(4+6)+5\)

\(=10-10+10-10+5\)

\(=5\)

Vậy  \(A=5\) 

B = 12 - 14 + 16 - 18 + ... + 2008 - 2010

B = -2 + (-2)+ (-2)+ (-2) + ...+ (-2)

B = -2 . 100

B = -200

Bạn muốn kết bạn chứ

a: =91/105+60/105-101/105

=50/105=10/21

c: \(\dfrac{3}{4}\cdot\dfrac{5}{2}\cdot\dfrac{7}{6}=\dfrac{3}{6}\cdot\dfrac{7}{2}\cdot\dfrac{5}{4}=\dfrac{1}{2}\cdot\dfrac{7}{2}\cdot\dfrac{5}{4}=\dfrac{35}{16}\)

d: =2-2/9

=18/9-2/9

=16/9

e: =24/36-9/36+8/36

=23/36

g: =5/2+1/2

=3

là 2S phải ko ?

dấu * là sao

là dấu nhân

\(=\left(\frac{-5}{7}+\frac{2}{7}\right).\left(15+-15\right).105.\left(\frac{2}{3}+\frac{4}{5}+\frac{1}{7}\right)\)

\(=\frac{-3}{7}.0.105.\left(\frac{2}{3}+\frac{4}{5}+\frac{1}{7}\right)\)

\(=0.\left(\frac{2}{3}+\frac{4}{5}+\frac{1}{7}\right)\)\(=0\)

13/15 + 4/7 + 101/105.       = 151/105+ 101/105 

                                                = 12/5

\(\frac{13}{15}+\frac{4}{7}+\frac{101}{105}\)

\(=\frac{91}{105}+\frac{60}{105}+\frac{101}{105}\)

\(=\frac{91+60+101}{105}\)

\(=\frac{252}{105}\)

\(=\frac{12}{5}\)

=12/5

tui con nho maaaaaaaa

??????????????/

??????