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

Toán Lớp 9: a. √27 – √12 + 2√75 b. 3√50 + √200 – 3√72 giúp mk với

Toán Lớp 9: a. √27 – √12 + 2√75
b. 3√50 + √200 – 3√72
giúp mk với

Comments ( 2 )

  1. a) \sqrt{27}-\sqrt{12}+2\sqrt{75}
    =\sqrt{9.3}-\sqrt{4.3}+2\sqrt{25.3}
    =3\sqrt{3}-2\sqrt{3}+2.5\sqrt{3}
    =\sqrt{3}+10\sqrt{3}
    =11\sqrt{3}
    b) 3\sqrt{50}+\sqrt{200}-3\sqrt{72}
    =3\sqrt{25.2}+\sqrt{100.2}-3\sqrt{36.2}
    =3.5\sqrt{2}+10\sqrt{2}-3.6\sqrt{2}
    =15\sqrt{2}+10\sqrt{2}-18\sqrt{2}
    =7\sqrt{2}
     

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