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

Toán Lớp 9: C= căn 17+12 căn 2 helpppppppp

Toán Lớp 9: C= căn 17+12 căn 2
helpppppppp

Comments ( 2 )

  1. C = sqrt{17+12sqrt2}
    = sqrt{8+12sqrt2+9}
    = sqrt{(2sqrt2)^2+2*6sqrt2+(sqrt9)^2}
    = sqrt{(2sqrt2+3)^2}
    = |2sqrt2 + 3|
    = 2sqrt2 + 3

  2. C=sqrt(17+12sqrt2) 
    =sqrt(8+2.2sqrt2.3+9)
    =sqrt((2sqrt2)^2+2.2sqrt2.3+3^2)
    =sqrt((2sqrt2+3)^2)
    =|2sqrt2+3|
    =2sqrt2+3

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

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