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

Toán Lớp 8: tính: `1/14.34 + 1/34.20 + 1/46.26 + 1/20.46 + 1/7.20 + 1/20.13`

Toán Lớp 8: tính: 1/14.34 + 1/34.20 + 1/46.26 + 1/20.46 + 1/7.20 + 1/20.13

Comments ( 1 )

  1. Giải đáp:
     3/{182}
    Lời giải và giải thích chi tiết:
    \qquad 1/14.34 + 1/34.20 + 1/46.26 + 1/20.46 + 1/7.20 + 1/20.13
    =1/{20}.(1/7+1/{13})+1/{34}. (1/{14}+1/{20})+1/{46}.(1/{20}+1/{26})
    =1/{20}. {20}/{7.\ 13}+1/{34}. {34}/{14. \ 20}+1/{46}. {46}/{20.\ 26}
    =1/{7.\ 13}+1/{14.\ 20}+1/{20.\ 26}
    =1/{7.\ 13}+1/{40.\ 7}+1/{40.\ 13}
    =1/{7.\ 13}+1/{40}. (1/7 +1/{13})
    =1/{91}+1/{40}. {20}/{91}
    =1/{91}+1/2 . 1/{91}
    =1/{91} . (1+1/ 2)
    =1/{91} . 3/2
    =3/{182}

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

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