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

Toán Lớp 2: Giúp em vs ạ 1+ 2 + 3+ -.+ 19

Toán Lớp 2: Giúp em vs ạ
1+ 2 + 3+ …..+ 19

Comments ( 2 )

  1. 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
    =(1+9)+(2+8)+(3+7)+(4+6)+(5+15)+(11+19)+(12+18)+(13+17)+(14+16)+10
    =10+10+10+10+20+30+30+30+30+10
    =10xx4+30xx5
    =40+150
    =190 
     

  2. Giải Thích Bước Giải
    1+ 2 + 3+ …..+ 19
    = ( 1+19)+(2+18)+(3+17)+….+(9+11)+10
    = 20 x 9 +10
    = 180+10
    =190

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

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