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

Toán Lớp 7: (39/4÷52/10+34/10×75/34)×(-25/16)

Toán Lớp 7: (39/4÷52/10+34/10×75/34)×(-25/16)

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết !
    ((39)/4 : (52)/(10)+(34)/(10) xx (75)/(34)) xx (-(25)/(16))
    = ((39)/4. (10)/(52)+(2550)/(340)) xx (-(25)/(16))
    = ((390)/(208)+(2550)/(340)) xx (-(25)/(16))
    = ((15)/8+(15)/2) xx (-(25)/(16)
    = ((15)/(8)+(60)/8) xx (-(25)/(16))
    = (75)/8 xx (-(25)/(16))
    = -(1875)/(128)
     
     

  2. (39/4:52/10+34/10×75/34)×(-25/16)
    =(39/4×10/52+34/10×75/34)×(-25/16)
    =(15/8 + 15/2)×(-25/16)
    =75/8×(-25/16)
    =-1875/128

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

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