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

Toán Lớp 9: Phan tich thanh nhan tu: 4a + 3√a – a√a -18

Toán Lớp 9: Phan tich thanh nhan tu: 4a + 3√a – a√a -18

Comments ( 1 )

  1. Giải đáp + giải thích các bước giải:
     4a+3\sqrt{a}-a\sqrt{a}-18
    =-a\sqrt{a}+6a-9\sqrt{a}-2a+12\sqrt{a}-18
    =-\sqrt{a}(a-6\sqrt{a}+9)-2(a-6\sqrt{a}+9)
    =(-\sqrt{a}-2)(a-6\sqrt{a}+9)
    =-(\sqrt{a}+2)(\sqrt{a}-3)^2

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

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