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

Toán Lớp 9: ( 4 căn 20 – 3 căn 125 + 15 can 1/5 ) : căn 5

Toán Lớp 9: ( 4 căn 20 – 3 căn 125 + 15 can 1/5 ) : căn 5

Comments ( 2 )

  1. Answer
    (4\sqrt{20} – 3\sqrt{125} + 15 . \sqrt{1/5}) : \sqrt{5}
    = (8\sqrt{5} – 15\sqrt{5} + 3\sqrt{5}) : \sqrt{5}
    = (-7\sqrt{5} + 3\sqrt{5}) : \sqrt{5}
    = -4\sqrt{5} : \sqrt{5}
    = -4

  2. ($4\sqrt{20}$ – $3\sqrt{125}$ + $15\sqrt{\dfrac{1}{5}}$) : $\sqrt{5}$
    = ( $8\sqrt{5}$ – $15\sqrt{5}$ + $3\sqrt{5}$) : $\sqrt{5}$
    = ($3\sqrt{5}$ – $7\sqrt{5}$) : $\sqrt{5}$
    = – ($4\sqrt{5}$) : $\sqrt{5}$
    = – 4
    #Ling
     

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