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

Toán Lớp 5: Tìm số tự nhiên x sao cho : 4/7 < x/10 < 5/7

Toán Lớp 5: Tìm số tự nhiên x sao cho :
4/7 < x/10 < 5/7

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    4/7 < x/10 < 5/7
    40/70 < (7x)/70 < 50/70
    7x = { 41;42;43;44;45;46;47;48;49}
    => 7xxx = 42 ; 49
    7xxx=42
    x=42:7
    x=6
    7xxx=49
    x=49:7
    x=7
    Vậy x = { 6 ; 7 }
    $#Vịt vàng$

  2. Giải đáp:
     4/7<x/10<5/7
    =>40/70<7x/70<50/70
    =>40<7x<50
    =>40:7<x<50:7
    =>5,714<x<7,143
    =>x∈{6;7}
    Vậy x=6,7

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