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

Toán Lớp 4: a/ 145+86+14+55 = = = b/ 1+2+3+4+5+6+7+8+9=

Toán Lớp 4: a/ 145+86+14+55 =
=
=
b/ 1+2+3+4+5+6+7+8+9=
=
=

Comments ( 2 )

  1. a,
    145 + 86 + 14 + 55
    = (145 + 55) + (86 + 14)
    = 200 + 100
    = 300
    b,
    1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
    = (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5
    = 10 + 10 + 10 + 10 + 5
    = 10 xx 4 + 5
    = 40 + 5
    = 45
     

  2. 145 + 86 + 14 + 55 
    = ( 145 + 55 ) + ( 86 + 14 )
    =  200 + 100
    = 300
    1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 
    = (1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 5
    = 10 + 10 + 10 + 10 + 5
    = 45

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