5 /14*7/15*28/7 (1/2+3/4)+4 2/3*10/21*3/2 (5/7+1/14)*7 22/5*12*5/12 1/2*3/4+1/2*1/4 7/2*7/15*28/7 11/3*26/7+26/7+8/3

0 bình luận về “5 /14*7/15*28/7 (1/2+3/4)+4 2/3*10/21*3/2 (5/7+1/14)*7 22/5*12*5/12 1/2*3/4+1/2*1/4 7/2*7/15*28/7 11/3*26/7+26/7+8/3”

1. `5/14 \times 7/15 \times 28/7`

   `= {5 \times 7 \times 4}/{14 \times 15}`

   `= 4/{2 \times 3}`

   `= 4/6 = 2/3`.

   `(1/2 + 3/4) + 4`

   `= (2/4 + 3/4) + 4`

   `= 5/4 + 4`

   `= 4 5/4`.

   `2/3 \times 10/21 \times 3/2`

   `= {2 \times 10 \times 3}/{3 \times 21 \times 2}`

   `= 10/21`.

   `(5/7 + 1/14) \times 7`

   `= (10/14 + 1/14) \times 7`

   `= 11/14 \times 7`

   `= 11/2`

   `22/5 \times 12 \times 5/12`

   `= {22 \times 12 \times 5}/{5 \times 12}`

   `= 22`.

   `1/2 \times 3/4 + 1/2 \times 1/4`

   `= 1/2 \times (3/4+1/4)`

   `= 1/2 \times 1`

   `= 1/2`.

   `7/2 \times 7/15 \times 28/7`

   `= {7 \times 7 \times 28}/{2 \times 15 \times 7}`

   `= {7 \times 14}/15`

   `= 98/15`.

   `11/3 \times 26/7 + 26/7 + 8/3`

   `= 26/7 \times (11/3 + 1) + 8/3`

   `= 26/7 \times 14/3 + 8/3`

   `= 52/3 + 8/3 = 60/3 = 20`.

   Trả lời

2. $\frac{5}{14}$ × $\frac{7}{15}$ × $\frac{28}{7}$

   = $\frac{5}{14}$ × $\frac{7}{15}$ × 4

   = $\frac{5}{14}$ × $\frac{28}{15}$

   = $\frac{140}{210}$ = $\frac{2}{3}$

   ($\frac{1}{2}$ +$\frac{3}{4}$) + 4

   = $\frac{4}{5}$ + 4

   = $\frac{21}{4}$

   ($\frac{5}{7}$ + $\frac{1}{4}$) × 7

   = $\frac{27}{28}$ × 7

   = $\frac{27}{4}$

   $\frac{22}{5}$ × 12 × $\frac{5}{12}$

   = $\frac{22}{5}$ × $\frac{5}{12}$ × 12

   = $\frac{11}{6}$ × 12

   = 22

   $\frac{1}{2}$ × $\frac{3}{4}$ + $\frac{1}{2}$ × $\frac{1}{4}$

   = $\frac{1}{2}$ × ($\frac{3}{4}$ + $\frac{1}{4}$)

   = $\frac{1}{2}$ × 1

   = $\frac{1}{2}$

   $\frac{7}{2}$ × $\frac{7}{15}$ × $\frac{28}{7}$

   = $\frac{7}{2}$ × $\frac{7}{15}$ × 4

   = $\frac{49}{30}$ × 4

   = $\frac{98}{15}$

   $\frac{11}{3}$ × $\frac{26}{7}$ + $\frac{26}{7}$ + $\frac{8}{3}$

   = $\frac{26}{7}$ × ($\frac{11}{3}$ × 1) + $\frac{8}{3}$

   = $\frac{26}{7}$ × $\frac{14}{3}$ + $\frac{8}{3}$

   = $\frac{58}{3}$ + $\frac{8}{3}$

   = 20

   Trả lời