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

Toán Lớp 9: √ a + 12a + 4a ² / √ b ² với a ≥ 3/2 và b < 0

Toán Lớp 9: √ a + 12a + 4a ² / √ b ² với a ≥ 3/2 và b < 0

Comments ( 2 )

  1. Sửa đề: \frac{\sqrt{9-12a+4a^2}}{\sqrt{b^2}}\ (a>=3/2; b<0)
    =\frac{\sqrt{(2a-3)^2}}{\sqrt{b^2}}
    =\frac{|2a-3|}{|b|}
    =\frac{2a-3}{-b}
    =\frac{-2a+3}{b}
     

  2. \frac{\sqrt{9-12a+4a^2}}{\sqrt{b^2}}(a>=3/2,b<0)(Sửa)
    =\frac{\sqrt{(3-2a)^2}}{|b|}
    =\frac{|3-2a|}{-b}
    =\frac{2a-3}{-b}

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

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