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

Toán Lớp 9: √(19- √7) căn tất cả 9 – căn 7

Toán Lớp 9: √(19- √7) căn tất cả 9 – căn 7

Comments ( 1 )

  1. \sqrt{19 – \sqrt{7}} . \sqrt{9 – \sqrt{7}}
    = \sqrt{(19 – \sqrt{7})(9 – \sqrt{7})}
    = \sqrt{19 . 9 – 19\sqrt{7} – 9\sqrt{7} + 7}
    = \sqrt{171 – 10\sqrt{7} + 7}

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