a)cách 1(3/4+1/6)x2/3 cách 2( 3/4+1/6)x2/3 b)cách 1(5/9-1/2)x3/4 cách 2(5/9-1/2)x3/4

0 bình luận về “a)cách 1(3/4+1/6)x2/3 cách 2( 3/4+1/6)x2/3 b)cách 1(5/9-1/2)x3/4 cách 2(5/9-1/2)x3/4”

1. `a)(3/4+1/6)xx2/3`

   Cách 1:

   `(3/4+1/6)xx2/3`

   `=(18/24+4/24)xx2/3`

   `=22/24xx2/3`

   `=11/12xx2/3`

   `=(11xx2)/(12xx3)`

   `=22/36`

   `=11/18`

   Cách 2:

   `(3/4+1/6)xx2/3`

   `=3/4xx2/3+1/6xx2/3`

   `=(3xx2)/(4xx3)+(1xx2)/(6xx3)`

   `=6/12+2/18`

   `=1/2+1/9`

   `=9/18+2/18`

   `=11/18`

   `b(5/9-1/2)xx3/4`

   Cách 1:

   `(5/9-1/2)xx3/4`

   `=(10/18-9/18)xx3/4`

   `=1/18xx3/4`

   `=(1xx3)/(18xx4)`

   `=3/72`

   `=1/24`

   Cách 2:

   `(5/9-1/2)xx3/4`

   `=5/9xx3/4-1/2xx3/4`

   `=(5xx3)/(9xx4)-(1xx3)/(2xx4)`

   `=15/36-3/8`

   `=5/12-3/8`

   `=10/24-9/24`

   `=1/24.`

   Bình luận

2. `a ) ( 3/4 + 1/6 ) × 2/3`

   `= ( 9/12 + 2/12 ) × 2/3`

   ` = 11/12 × 2/3`

   `= 22/36 = 11/18`

   `b ) ( 3/4 + 1/6 ) × 2/3`

   `= 3/4 × 2/3 + 1/6 × 2/3`

   `= 1/2 + 1/9`

   `= 9/18 + 2/18`

   `= 11/18`

   `c ) ( 5/9 – 1/2 ) × 3/4`

   `= ( 10/18 – 9/18 ) × 3/4`

   `= 1/18 × 3/4`

   `= 3/72 = 1/24`

   `d ) ( 5/9 – 1/2 ) × 3/4`

   `= 5/9 × 3/4 – 1/2 × 3/4`

   `= 5/12 – 3/8`

   `= 10/24 – 9/24`

   `= 1/24`

   `#dtkc`

    

   Bình luận