Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 3: tính nhanh 1+2+3+4+5+6+7+8+9+10

Toán Lớp 3: tính nhanh
1+2+3+4+5+6+7+8+9+10

Comments ( 2 )

  1. 1+2+3+4+5+6+7+8+9+10
    = (  +  ) + ( +8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 10 + 
    =10+10+10+10+10+5
    =(10+10)+(10+10)+15
    =20+20+15
    =55
    LeCaoTrung#hd247#

  2. # tcv
    1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
    = ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 10 + 5
    = 10 + 10 + 10 + 10 + 10 + 5
    = 10 xx 5 + 5
    = 50 + 5
    = 55

Leave a reply

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