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

Toán Lớp 7: a)3/2x-5/4=x/2+3/4 b)2/3x+4=x3/2+1/2

Toán Lớp 7: a)3/2x-5/4=x/2+3/4
b)2/3x+4=x3/2+1/2

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a, 3/2x – 5/4 = x/2 + 3/4
        3/2x – x/2 = 5/4 + 3/4
        x . ( 3/2 – 1/2 ) = 2
        x = 2 : 1
        x = 2
    b, 2/3x + 4 = (x3)/2 + 1/2
        2/3x – (x3)/2 = 1/2 – 4
        x . ( 2/3 – 3/2 ) = 1/2 – 8/2
        x = -7/2 : (-1)/2
        x = 7/2 . 2
        x = 7

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

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