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

Toán Lớp 5: tìm x 72 : ( 3x X ) – 9 = 63 120: ( x – 15 ) + 3 = 9

Toán Lớp 5: tìm x
72 : ( 3x X ) – 9 = 63
120: ( x – 15 ) + 3 = 9

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    72 : ( 3 xx x ) – 9 = 63
    72 : ( 3 xx x ) = 63 + 9
    72 : ( 3 xx x ) = 72
    3 xx x = 72 : 72
    3 xx x = 1
    x = 1 : 3
    x = 1/3
    120 : ( x – 15 ) + 3 = 9
    120 : ( x – 15 ) = 9 – 3 
    120 : ( x – 15 ) = 6
    x – 15 = 120 : 6 
    x – 15 = 20
    x = 20 + 15
    x = 35

  2. 72:(3xx x)-9=63
    72:(3xx x)=63+9
    7x:(3xx x)=72
    3xx x=72:72
    3xx x=1
    x=1/3
    Vậy x=1/3
    120:(x-15)+3=9
    120:(x-15)=9-3
    120:(x-15)=6
    x-15=120:6
    x-15=20
    x=20+15
    x=35
    Vậy x=35.

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