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

Toán Lớp 6: a)-564+[(-724)+564+224] b) -87+(-12)-(-487)+512 c) 942 -2567+2563-1942 d)17+(-20)+23+(-26) +… +53+(-56) e)1152-(374+1152)+(-65+374) f

Toán Lớp 6: a)-564+[(-724)+564+224]
b) -87+(-12)-(-487)+512
c) 942 -2567+2563-1942
d)17+(-20)+23+(-26) +… +53+(-56)
e)1152-(374+1152)+(-65+374)
f)-2005+(-21+75+2005)
Ai nhanh tay nhất mình sẽ vote 5* ,câu trả lời hay nhất và cảm ơn ạ!

Comments ( 1 )

  1. $ a)-564+[(-724)+564+224] = -564+(-724)+564+224=(-564+564)+[(-724)+224]=-500 $
    $ b) -87+(-12)-(-487)+512 = [-87-(-487)]+[(-12)+512)]=(-87+487)+500=400+500=900 $ 
    $ c) 942 -2567+2563-1942=(942-1942)+(-2567+2563)=(-1000)+(-4)=-1004 $ 
    $ d)17+(-20)+23+(-26) +… +53+(-56) = ( -3)+(-3)+…+(-3)=(-3).7=-21 $ 
    $ e)1152-(374+1152)+(-65+374)=1152-374-1152+(-65)+374=(1152-1152)+(-374+374)+(-65)=-65 $ 
    $ f)-2005+(-21+75+2005) = -2005 + ( -21)+75+2005=(-2005+2005)+(-21+75)=54 $

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

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