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

Toán Lớp 5: 3455+(234+x)=7129 37,69-(4,53+x)=17,49 34,56-(x+3,56)=12,78 78,54-(576,8-x)=5,379

Toán Lớp 5: 3455+(234+x)=7129
37,69-(4,53+x)=17,49
34,56-(x+3,56)=12,78
78,54-(576,8-x)=5,379

Comments ( 2 )

  1. 1. 3455+(234+x)=7129
                   234+x =7129 – 3455
                   234+x= 3674
                           x= 3674 – 234
                           x= 3440
    2. 37,69-(4,53+x)=17,49
                   4,53+x= 37,69-17,49
                   4,53+x=20,2
                             x= 20,2-4,53
                             x=      15,67
    3. 34,56-(x+3,56)=12,78
                   x+3,56 = 34,56-12.78
                   x+3,56 =21,78
                        x= 21,78-3,56
                        x= 18,22
    4. 78,54-(576,8-x)=5,379
                   576,8-x= 78,54-5,379
                   576,8-x=73,161
                             x= 576,8-73,161
                             x = 503,639
     

  2. Lời giải và giải thích chi tiết:
    3455 + (234 + x) = 7129
    234 + x = 3674
    x = 3440
    37,69 – (4,53 + x) = 17,49
    4,53 + x = 20,2
    x = 15,67
    34,56 – (x + 3,56) = 12,78
    x + 3,56 = 21,78
    x = 18,22
    78,54 – (576,8 – x) = 5,379
    576,8 – x = 73,161
    x = 503,639

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

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