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所求积分=∫<1,2>√[x-1+1/4]dx
=(2/3)(x-3/4)^(3/2)|<1,2>
=(2/3)[(5/4)^(3/2)-(1/4)^(3/2)]
=(2/3)(5√5-1)/8
=(5√5-1)/12.
=(2/3)(x-3/4)^(3/2)|<1,2>
=(2/3)[(5/4)^(3/2)-(1/4)^(3/2)]
=(2/3)(5√5-1)/8
=(5√5-1)/12.
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