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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tinh nhanh a,3/7×2/5×7/3×20×19/72 b,6/7×8/13+6/13×9/7-3/13×6/7

Home/ Toán Lớp 6: tinh nhanh a,3/7×2/5×7/3×20×19/72 b,6/7×8/13+6/13×9/7-3/13×6/7

Toán Lớp 6: tinh nhanh a,3/7×2/5×7/3×20×19/72 b,6/7×8/13+6/13×9/7-3/13×6/7

Tháng Một 17, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: tinh nhanh a,3/7×2/5×7/3×20×19/72 b,6/7×8/13+6/13×9/7-3/13×6/7

Comments ( 2 )

  1. quynhmaithu
    quynhmaithu
    17 Tháng Một, 2023 at 5:52 sáng
    Reply
    a, 3/7 . 2/5 . 7/3. 20 . 19/72
    =(3/7 . 7/3). 2/5 . 20 . 19/72
    =1. 2/5 . 20 . 19/72
    =4. 19/72
    =19/9
    b, 6/7×8/13+6/13×9/7-3/13×6/7
    = 8/7 × 6/13 + 6/13 × 9/7 – 3/13 × 6/7
    = 6/13 × ( 8/7 + 9/7 – 6/7 )
    = 12/13

  2. tonhitruc
    tonhitruc
    17 Tháng Một, 2023 at 5:52 sáng
    Reply
    a, 3/7 xx 2/5 xx 7/3 xx 20 xx 19/72
    = ( 3/7 xx 7/3 ) xx ( 2/5 xx 20 xx 19/72 )
    = 1 xx ( 8 xx 19/72 )
    = 1 xx 19/9
    = 19/9
    b, 6/7 xx 8/13 + 6/13 xx 9/7 – 3/13 xx 6/7
    = ( 6 xx 8 )/( 7 xx 13 ) + 6/13 xx 9/7 – ( 3 xx 6 )/( 13 xx 7 )
    = 6/13 xx 8/7 + 6/13 xx 9/7 – 3/7 xx 6/13
    = 6/13 xx ( 8/7 + 9/7 – 3/7 )
    = 6/13 xx 2
    = 12/13

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222-9+11+12:2*14+14 = ? ( )

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