2/3x(5/12+7/12)+1/3

2/3x       1        +1/3

2/3+1/3

=1              k mik nhaaaaa

5/12×2/3+2/3×7/12+1/3

=2/3×(5/12+7/12)+1/3

=2/3×          1          +1/3

=              2/3           +1/3

=                       1

\(\frac{5}{12}.\frac{2}{3}+\frac{2}{3}.\frac{7}{12}+\frac{1}{3}\)

\(=\frac{2}{3}.\left(\frac{5}{12}+\frac{7}{12}\right)+\frac{1}{3}\)

\(=\frac{2}{3}.\frac{12}{12}+\frac{1}{3}\)

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

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

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

Dấu "." bằng dấu x

nhầm:

5/12x2/3+2/3x7/12++1/3

5/12 x 2/3 + 2/3 x 7/12 + 1/3

= 2/3 x ( 5/12 + 7/12 ) + 1/3

= 2/3 x 1 + 1/3

= 2/3 + 1/3

= 1

5/12x2/3+2/3x7/12+1/3

=2/3x(5/12+7/12)+1/3

=2/3x1+1/3

=2/3+1/3

=1

k tui nha @@@

\(\frac{5}{12}\)x \(\frac{2}{3}\)+ \(\frac{2}{3}\)x \(\frac{7}{12}\)+ \(\frac{1}{3}\)

= \(\frac{2}{3}\)x ( \(\frac{5}{12}\)+ \(\frac{7}{12}\) ) + \(\frac{1}{3}\)

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

= \(\frac{2}{3}\)+ \(\frac{1}{3}\)

= 1

2/3*(5/12+7/12) +1/3 = 2/3*12/12+1/3

= 2/3+1/3= 1

có khác gì câu ở trên của Linh Nguyễn Channel đâu trời

= { 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

` 3xx 7/10 + 7/10 xx 5 +2 xx 7/10`

`=7/10 xx (3+5+2)`

`= 7/10 xx 10`

`=7`

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}=\dfrac{7}{10}\times\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)

7

\(\dfrac{7}{10}\left(4+3-7\right)=\dfrac{7}{10}\times0=0\)

\(\dfrac{7}{10}\left(4+3-7\right)=\dfrac{7}{10}\times0=0\)

= 7/10 x(4 + 3 - 7)

= 0

`3/4+2/5+3/12`

`=3/4+3/12+2/5`

`=9/12+3/12+2/5`

`=12/12+2/5`

`=1+2/5`

`=7/5`

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 

= ( 1 + 12 ) + ( 2 + 11 ) + ( 3 + 10 ) + ( 4 + 9 ) + ( 5 + 8 ) + ( 6 + 7 ) 

=     13         +     13       +     13       +      13     +    13      + 13

=               13 x 6 

=                 78

sai thui

1+2+3+4+5+6+7+8+9+10+11+12

=(1+9)+(2+8)+(3+7)+(4+6)+(5+10)+(11+12)

=10+10+10+10+15+23

=10×4+15+23

=40+15+23

=55+23

=78

ủng hộ nha có gì sai sót mong bạn thông cảm cho !!!

1 + 2 + 3 + 4 +5 + 6 + 7 + 8 + 9 + 10 +11 + 12

= ( 12 + 8 ) + ( 11 + 9 ) + ( 7 + 3 ) + ( 6 + 4 ) + ( 10 + 2 + 3 ) + 1

Mình cũng không biết nữa !