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

Toán Lớp 6: 1/1×3 +1/2×3 +1/2×5+ 1/3×5+ 1/3×7 +1/4×7 +1/4×9

Toán Lớp 6: 1/1×3 +1/2×3 +1/2×5+ 1/3×5+ 1/3×7 +1/4×7 +1/4×9

Comments ( 2 )

  1. 1/1×3+1/2×3+1/2×5+1/3×5+1/3×7+1/4×7+1/4×9
    =3+1/2 .(3+5)+1/3 .(5+7)+1/4 .(7+9)
    =3+1/2 .8+1/3 .12+1/4 .16
    =3+8/2+12/3+16/4
    =3+4+4+4
    =15
    $@ThanhTruc2008$

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

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