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

Toán Lớp 9: (3 căn5 – 2 căn3) căn5 + căn60

Toán Lớp 9: (3 căn5 – 2 căn3) căn5 + căn60

Comments ( 2 )

  1. Answer
    (3\sqrt{5} – 2\sqrt{3}) . \sqrt{5} + \sqrt{60}
    = 3\sqrt{5} . \sqrt{5} – 2\sqrt{3} . \sqrt{5} + \sqrt{60}
    = 15 – 2\sqrt{15} + \sqrt{60}
    = 15 – 2\sqrt{15} + \sqrt{60}
    = 15 – 2\sqrt{15} + 2\sqrt{15}
    = 15 – 0
    = 15

  2. Giải đáp:
    (3sqrt5-2sqrt3)sqrt5+sqrt60
    = 3sqrt5sqrt5-2sqrt3sqrt5+sqrt4sqrt15
    = 3.5-2sqrt15+2sqrt15
    = 15-2sqrt5+2sqrt15
    = 15

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