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

Toán Lớp 6: thpt a ( – 31 ) + ( -120) + ( -49 ) b ( -127 ) + ( -105 ) + ( -45) + ( -23) c ( -31) + 75 + ( -59) + ( -25) d ( -71) + 31 + ( -20)

Toán Lớp 6: thpt
a ( – 31 ) + ( -120) + ( -49 )
b ( -127 ) + ( -105 ) + ( -45) + ( -23)
c ( -31) + 75 + ( -59) + ( -25)
d ( -71) + 31 + ( -20)

Comments ( 2 )

  1. a) (-31) + (-120) + (-49)
    =-151 + (-49)
    =-200
    b)(-127) + (-105) + (-45) + (-23)
    =[(-127 + (-23)] + [(-105) +(-45)]
    =(-200)  + (-150)
    =-350
    c) (-31) + 75 + (-59) + (-25)
    =[(-31) + (-59)]  + [75+ (-25)]
    =(-90) + 50
    =-40
    d)(-71) + 31 + (-20)
    =[(-71) + 31] + (-20)
    =40 + (-20) 
    =20 

  2. Giải đáp:
     munz gửi
    Lời giải và giải thích chi tiết:
    $\text{a, ( -31) + ( – 120) + ( -49) }$
    $\text{=[ – 31 + ( -49) ] + ( -120)}$
    $\text{= – 80 + – 120 }$
    $\text{= – 200}$
    $\text{b, ( – 127 ) + ( -105 ) + ( – 45 ) + ( -23)}$
    $\text{= [ – 23 + ( -127 ) ] + [ – 105 + ( – 45) ] }$
    $\text{= – 150 + – 150 }$
    $\text{= – 300}$
    $\text{c, ( – 31 ) + 75 + ( -59 ) + ( -25)}$
    $\text{= [(-31+ ( – 59) ] +  75 + ( – 25 ) ]}$
    $\text{=- 90 + -50}$
    $\text{= – 40}$
    $\text{d, ( -71) + 31 + ( -20) }$
    $\text{= [ – 20 + 31 ]+ ( -71) }$
    $\text{= 51 + ( -71) }$
    $\text{= – 20}$

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