\(3\cdot\frac{1}{4}+\frac{1}{12}\cdot\frac{1}{4}+\frac{35}{12}\cdot\frac{1}{4}\)

\(=(3+\frac{1}{12}+\frac{35}{12})\cdot\frac{1}{4}\)

\(=(3+\frac{36}{12})\cdot\frac{1}{4}\)

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

\(=6\cdot\frac{1}{4}=\frac{6}{4}\)

= { 1/3 + 2/3 + 4/3 } + { 5/12 + 1/12 }

=7/3 + 6/12 = 102/36

Rút gọn = 51/18

= ( 1/3 + 2/3 + 4/3 ) + ( 5/12 + 1/12 )

= 7/3 + 6/12

= 28/12 + 6/12

= 34/12 = 17/6

  3/4 x 7/12 + 3/4 x 1/6 + 3/4 x 1/4

=3/4 x (7/12 + 1/6 + 1/4)

=3/4 x (7/12 + 2/12 + 3/12)

=3/4 x 1

=3/4

Chúc học tốt~

3/4x7/12+3/4x1/6+3/4x1/4=3/4x(7/12+1/6+1/4)=3/4x1=3/4

cam on

\((\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \)x \((\frac{36}{9}-\frac{12}{9}:\frac{1}{3}) \)

\(= (\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \) x \((\frac{36}{9}-\frac{36}{9})\)

\( = (\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \) x \(0\)

\(= 0\)

\(=\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{4}{5}+\dfrac{2}{3}+\dfrac{1}{4}\)

=(1/3+2/3)+(1/4+1/4)+(1/5+4/5)

=1+1+1/2

=5/2

\(\dfrac{5}{2}\)

`5/9xx1/4+4/9xx3/12`

`=5/9xx1/4+4/9xx1/4`

`=1/4xx(5/9+4/9)`

`=1/4xx9/9`

`=1/4xx1`

`=1/4`

5/9.1/4+4/9.1/4=(5/9+4/9).1/4=1.1/4=1/4

Tính máy tính cho nhanh bn

Bn chép sai hay so mà mình tính máy tính dư.

1)     \(\frac{1}{12}+\frac{1}{16}+\frac{3}{4}\)

\(=\frac{4}{48}+\frac{3}{48}+\frac{36}{48}\)

\(=\frac{4+3+36}{48}\)

\(=\frac{43}{48}\)

2)   a)    \(\frac{1}{15}+\frac{4}{15}+\frac{5}{18}+\frac{7}{18}\)

\(=\left(\frac{1}{15}+\frac{4}{15}\right)+\left(\frac{5}{18}+\frac{7}{18}\right)\)

\(=\frac{1}{3}+\frac{2}{3}=1\)

b)    \(\frac{1}{8}+\frac{1}{12}+\frac{3}{8}+\frac{5}{12}\)

\(=\left(\frac{1}{8}+\frac{3}{8}\right)+\left(\frac{1}{12}+\frac{5}{12}\right)\)

\(=\frac{1}{2}+\frac{1}{2}=1\)