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

Toán Lớp 9: 2 √45-3 √24- √80+4 √54 giúp mình trả lời câu hỏi này

Toán Lớp 9: 2 √45-3 √24- √80+4 √54
giúp mình trả lời câu hỏi này

Comments ( 2 )

  1. 2\sqrt{45} – 3\sqrt{24} – \sqrt{80} + 4\sqrt{54}
    = 2\sqrt{3^2 . 5} – 3\sqrt{2^2 . 6} – \sqrt{4^2 . 5} + 4\sqrt{3^2 . 6}
    = 6\sqrt{5} – 6\sqrt{6} – 4\sqrt{5} + 12\sqrt{6}
    = (6 – 4)\sqrt{5} + (12 – 6)\sqrt{6}
    = 2\sqrt{5} + 6\sqrt{6}

  2. 2\sqrt{45}-3\sqrt{24}-\sqrt{80}+4\sqrt{54}
    =6\sqrt{5}-6\sqrt{6}-4\sqrt{5}+12\sqrt{6}
    =2\sqrt{5}+6\sqrt{6}
     

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

About Thúy Mai