5/7 . 5/11 + 5/7 . 6/11 – 2/7 1/2x – 33/55 =20/50 5/6 + 1/5 – 2/3

Question

5/7 . 5/11 + 5/7 . 6/11 – 2/7
1/2x – 33/55 =20/50
5/6 + 1/5 – 2/3

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Melody 3 tháng 2021-09-20T17:32:27+00:00 2 Answers 9 views 0

Answers ( )

    0
    2021-09-20T17:34:01+00:00

      5/7.5/11+5/7.6/11-2/7                         1/2x-22/55=20/50

    =5/7.(5/11+6/11)-2/7                             1/2x          = 2/5+3/5

    =5/7.         1        -2/7                              1/2x         =      1      

    =     5/7               -2/7                                   x         =    1:1/2

    =                 3/7                                             x         =      2

      5/6+1/5-2/3

    =   31/30-2/3

    =         11/30

    0
    2021-09-20T17:34:26+00:00

    a, 5/7 . 5/11 + 5/7 . 6/11 – 2/7

    = 5/7 . (5/11 + 6/11) – 2/7

    = 5/7 . 1 – 2/7

    = 3/7

    b, 1/2x – 33/55 = 20/50

        1/2x – 3/5 = 2/5

        1/2x = 2/5 + 3/5

        1/2x = 1

         x = 1 : 1/2

         x = 2

    c, 5/6 + 1/5 – 2/3 

    = 25/30 + 6/30 – 20/30

    = 11/30

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