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

Toán Lớp 6: Tìm x biết : a,15 + ( x – 10 ) = – 7 b, -25 – ( x – 4 ) = 3 c, 35 – ( x + 5 ) = 347 -(15 + 347 )

Toán Lớp 6: Tìm x biết :
a,15 + ( x – 10 ) = – 7
b, -25 – ( x – 4 ) = 3
c, 35 – ( x + 5 ) = 347 -(15 + 347 )

Comments ( 2 )

  1.  
    Lời giải và giải thích chi tiết:
     a) 15+(x-10)=-7
    x-10=(-7)-15
    x-10=-22
    x=(-22)+10
    x=-12
    Vậy  x=-12
    b) -25-(x-4)=3
    x-4=(-25)-3
    x-4=-28
    x=(-28)+4
    x=-24
    Vậy  x=-24
    c) 35-(x+5)=347-(15+347)
    35-(x+5)=347-15-347
    35-(x+5)=347-347-15
    35-(x+5)=-15
    x+5=35-(-15)
    x+5=50
    x=50-5
    x=45
    vậy  x=45

  2. a)
    15 + ( x – 10 ) = -7
    x – 10 = -7 – 15
    x – 10 = -22
    x = -22 + 10
    x = -12
    b) 
    -25 – ( x – 4 ) = 3
    x – 4 = -25 – 3
    x – 4 = -28
    x = -28 + 4
    x = -24
    c)
    35 – ( x + 5 ) = 347 – ( 15 + 347 )
    35 – ( x + 5 ) = 347 – 362
    35 – ( x + 5 ) = -15
    x + 5 = 35 – -15
    x + 5 = 50
    x = 50 – 5
    x = 45

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