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

Toán Lớp 6: 1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 x 12

Toán Lớp 6: 1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 x 12

Comments ( 2 )

  1. Giải đáp:
    279.
    Lời giải và giải thích chi tiết:
    1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 × 12.
    = (1+2+3+4+5+6+7+8+9)\times3+(1+2+3+4+5+6+7+8)+9\times12.
    = 135+36+108.
    = 171+108.
    = 279.

  2. 1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9xx12
    =1xx4+2xx4+4xx4+5xx4+6xx4+7xx4+8xx4+9xx4xx12
    =4xx(1+2+3+4+5+6+7+8+9)xx12
    =4xx[(1+9)+(2+8)+(3+7)+(4+6)+5]xx12
    =4xx[10+10+10+10+5]xx12
    =4xx55xx12
    =220xx12
    =2640

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