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

Toán Lớp 6: Tính hợp lí a) -18-35+(-72)-65 b)-34-25-16+25 c)27-113-47-(-123) d)49-(-135)-35-149

Toán Lớp 6: Tính hợp lí
a) -18-35+(-72)-65
b)-34-25-16+25
c)27-113-47-(-123)
d)49-(-135)-35-149

Comments ( 2 )

  1. a) -18-35 + (-72) – 65 
    = -90 – 100
    = -190
    b) (-34) – 25 – 16 + 25 
    = (-34) – 16 + 25 – 25 
    = – 50 
    c) 27 – 113 – 47 – (-123 )
    = -160 + 27 + 123
    = -160 + 150 
    =- 10 
    d) 49 -(-135) – 35 – 149 
    = 49 – 149 + 135 – 35
    = -100 + 100
    = 0

  2. a) -18 – 35 + ( -72 ) – 65
    = -18 – 35 – 72 – 65
    = ( -18 – 72 ) – ( 35 + 65 )
    = -90 – 100
    = -190
    b) -34 – 25 – 16 + 25
    = ( -34 – 16 ) + ( -25 + 25 )
    = -50 + 0
    = -50
    c) 27 – 113 – 47 – ( -123 )
    = 27 – 113 – 47 + 123
    = ( 27 – 47 ) + ( -113 + 123 )
    = -20 + 10
    = -10
    d) 49 – ( -135 ) – 35 – 149
    = 49 + 135 – 35 – 149 
    = ( 49 – 149 ) + ( 135 – 35 )
    = -100 + 100
    = 0

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

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