9/14:6/7 +3/12:2*1/2

 =3/4+1/8:2*1/2

=3/4+1/16*1/2

=3/4+1/32

=25/32

\(\frac{9}{14}\): \(\frac{6}{7}\) + \(\frac{3}{12}\): \(2\)x\(\frac{1}{2}\)

= \(\frac{3}{4}\)\(+\)\(\frac{1}{8}\)x\(\frac{1}{2}\)

=\(\frac{3}{4}\)\(+\)\(\frac{1}{16}\)

=\(\frac{9}{16}\)\(+\)\(\frac{1}{16}\)

= \(\frac{10}{16}\)

=\(\frac{5}{8}\)

nhé

9/14 : 6/7 + 3/12 : 2 * 1/2 =13/16

\(\frac{13}{16}\)nhé

Nếu mình đúng thì các bạn k mình nhé

\(\frac{9}{14}:\frac{6}{7}+\frac{3}{12}:2x\frac{1}{2}\)

\(=\frac{9}{14}x\frac{7}{6}+\frac{3}{12}\)

\(=\frac{3x3x7}{7x2x3x2}\)

\(=\frac{3}{4}\)

13/16 nha

a: =152,3+7,7+2021,19-2021,19

=160

b: =7/15*3/14*20/13

\(=\dfrac{7}{14}\cdot\dfrac{3}{15}\cdot\dfrac{20}{13}=\dfrac{1}{2}\cdot\dfrac{1}{5}\cdot\dfrac{20}{13}=\dfrac{2}{13}\)

c: \(=\dfrac{7}{4}\left(\dfrac{13}{12}-\dfrac{10}{12}\right)+\dfrac{5}{6}=\dfrac{7}{16}+\dfrac{5}{6}=\dfrac{61}{48}\)

\(\frac{-3}{-9}\)+\(\frac{8}{7}\)+\(\frac{1}{-3}\)+\(\frac{26}{14}\)

=+\(\frac{8}{7}\)+\(\frac{1}{-3}\)+\(\frac{13}{7}\)

=\(\frac{1}{3}\)+\(\frac{1}{-3}\)+\(\frac{8}{7}\)+\(\frac{13}{7}\)

=0+\(\frac{8}{7}\)+\(\frac{13}{7}\)

=\(\frac{21}{7}\)

=3

Mình đang rất cần.

Cảm ơn Đinh Như Diệp nhìu.

3/4 x 4/5 : 3/5 x 6/7 : 1/7 x 5/6

= 3/4 x 4/5 x 5/3 x 6/7 x7/1 x 5/6

= 5

1.

\(a,\frac{1}{7}+\frac{3}{4}+\frac{2}{7}+\frac{4}{7}=\frac{1}{7}+\frac{2}{7}+\frac{4}{7}+\frac{3}{4}\)

\(=1+\frac{3}{4}=\frac{7}{4}.\)

\(b,\frac{4}{7}:\frac{2}{5}+\frac{3}{7}:\frac{2}{5}-\frac{7}{9}=\left(\frac{4}{7}+\frac{3}{7}\right):\frac{2}{5}-\frac{7}{9}\)

\(=1:\frac{2}{5}-\frac{7}{9}=\frac{5}{2}-\frac{7}{9}\)

\(=\frac{31}{18}.\)

a)3/4+(1/7+2/7+4/7)

=3/4+1

=7/4

b)2/5:(4/7+3/7)-7/9

=2/5:1-7/9

=2/5-7/9

=-17/45

31/18

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

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