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

Toán Lớp 9: Rút gọn biểu thức A=√2 -√45 +3√18+√72

Toán Lớp 9: Rút gọn biểu thức
A=√2 -√45 +3√18+√72

Comments ( 2 )

  1. #tnvt
    A=\sqrt{2}-\sqrt{45}+3\sqrt{18}+\sqrt{72}
    =\sqrt{2}-\sqrt{3^2 .5}+3\sqrt{3^2 .2}+\sqrt{6^2 .2}
    =\sqrt{2}-3\sqrt{5}+9\sqrt{2}+6\sqrt{2}
    =16\sqrt{2}-3\sqrt{5}

  2. A=\sqrt{2}-\sqrt{45}+3\sqrt{18}+\sqrt{72}
    =\sqrt{2}-\sqrt{9.5}+3\sqrt{9.2}+\sqrt{36.2}
    =\sqrt{2}-3\sqrt{5}+9\sqrt{2}+6\sqrt{2}
    =16\sqrt{2}-3\sqrt{5}

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