化简 DOM(sqrt((4-x)(x+2))+5/(x-3))

解答

化简

D OM ((4 - x) (x + 2) + \frac{5}{x - 3})

D OM (4 - x x + 2 + \frac{5}{x - 3})

求解步骤

D OM ((4 - x) (x + 2) + \frac{5}{x - 3})

使用根式运算法则:

ab = a b,

假定

a \geq 0, b \geq 0

(4 - x) (x + 2) = 4 - x x + 2

= D OM (4 - x x + 2 + \frac{5}{x - 3})

e x p an d \frac{10 ( 3 - 3 )}{3}

e x p an d \frac{81 b ^{3} y ^{2} - 3}{y ( x + 3 ) ^{2}}

e x p an d \frac{4 ( x + 1 )}{5 - 4 x}

e x p an d ((((4 x^{3} y^{-} 2)^{3})^{0})^{5})^{-} 4

e x p an d (8 x + 5 y = - 7) 6