Tinh nhanh 3,63+5,13+6,63+8,13+9,63+11,13+12,63+14,13+15,63+17,13+18,63

Tinh nhanh
3,63+5,13+6,63+8,13+9,63+11,13+12,63+14,13+15,63+17,13+18,63

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  1. 3,63+5,13+6,63+8,13+9,63+11,13+12,63+14,13+15,63+17,13+18,63

    = (3,63 + 6,63 + 9,63 + 12,63 + 15,63 + 18,63) + (5,13 + 8,13 + 11,13 + 14,13 + 17,13).

    = (3,63 + 18,63) x 6 : 2  + (5,13 + 17,13) x 5 : 2

    = 66,78 + 55,65

    = 122,43

    Học tốt!!!

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  2.   3,63+5,13+6,63+8,13+9,63+11,13+12,63+14,13+15,63+17,13+18,63

    =(3,63+5,13)+(6,63+8,13)+(9,63+11,13)+(12,63+14,13)+(15,63+17,13)+18,63

    =8,76+14,76+20,76+26,76+32,76+18,63

    =(8,76+14,76)+(20,76+26,76)+(32,76+18,63)

    =23,52+47,52+51,39

    =71,04+51,39

    =122,43

    CHÚC BN HOK TỐT

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