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

Toán Lớp 5: 1 : 1/1000+13/1000+25/1000+37/1000+49/1000+…+87/1000+99/1000 Giúp nhanh nhé mình cần gấp

Toán Lớp 5: 1 : 1/1000+13/1000+25/1000+37/1000+49/1000+…+87/1000+99/1000
Giúp nhanh nhé mình cần gấp

Comments ( 2 )

  1. 1/1000 + 13/1000 + 25/1000 + 37/1000 + 49/1000 + … + 87/1000 + 99/1000
    = (1 + 13 + 25 + 37 + 49 + … + 87 + 99)/1000
    Đặt : A
    A=1+13+25+37+49+…+87+99
    A=(1+99)+(13+87)+(25+75)+(37+63)+(49+51)
    A=100+100+100+100+100
    A=100×5
    A=500
    =>1/1000 + 13/1000 + 25/1000 + 37/1000 + 49/1000 + … + 87/1000 + 99/1000=500/1000
    =>500/1000=1/2
     

  2. Giải đáp:
    =1 + 13 + 25 + 37 + 49 +51 + 63 + 75 +  87 + 99/1000
    = ( 1 + 99 ) + ( 13 + 87 ) + ( 25 + 75 ) + ( 37 + 63 ) + ( 49 + 51 )/ 1000
    = 5 x 100/1000
    = 500/1000
    = 1/2

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