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

Toán Lớp 6: a,32x(-139)+(-32)x(-39) b,7x-(-9)=4x+18 c, |x-1|-5=4

Toán Lớp 6: a,32x(-139)+(-32)x(-39)
b,7x-(-9)=4x+18
c, |x-1|-5=4

Comments ( 2 )

  1. a. 32.(-139) + (-32).(-39)
    =-32.(139 – 39)
    = -32.100
    = -3200
    b. 7x-(-9) = 4x + 18
    <=> 7x + 9 = 4x + 18
    <=> 7x – 4x = 18 – 9
    <=> 3x = 9
    => x = 3
    Vậy x=3
    c. |x-1| – 5 = 4
    <=> |x-1| = 9
    => {{:(x-1=9),(x-1=-9):}
    => {{:(x=10),(x==8):}
    Vậy x in {10;-8}
     

  2. a) 32x . (-139) + (-32)x . (-139)
    = -139 . (32x – 32x)
    = -139 . 0
    = 0
    b) 7x – (-9) = 4x + 18
    => 7x + 9 = 4x + 18
    => 7x – 4x = 18 – 9
    => 3x = 9
    => x = 3
    c) |x – 1| – 5 = 4
    => |x – 1| = 9
    => x – 1 = ±9
    => x = 10 hoặc x = -8.

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

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