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

Toán Lớp 5: Tìm x:x:0,25+x×0,25=3,4 0,7:x=0,75-0,5:x

Toán Lớp 5: Tìm x:x:0,25+x×0,25=3,4
0,7:x=0,75-0,5:x

Comments ( 1 )

  1. x : 0,25 + x xx 0,25 = 3,4
    x xx 4 + x xx 0,25 = 3,4
    x xx (4 + 0,25) = 3,4
    x xx 4,25 = 3,4
    x = 3,4 : 4,25
    x = 0,8
    0,7 : x = 0,75 – 0,5 : x
    0,7 xx 1/x + 0,5 xx 1/x = 0,75
    1/x xx (0,7 + 0,5) = 0,75
    1/x xx 1,2 = 0,75
    1/x = 0,75 : 1,2
    1/x = 0,625
    1/x = 5/8
    5/(5x) = 8
    5x = 8
    x = 8 : 5
    x = 1,6
     

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