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已知:a1/2+a-1/2=3(a3/2-a-3/2)/(a1/2-a-1/2)
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已知:a1/2+a-1/2=3 (a3/2-a-3/2)/( a1/2-a-1/2)
▼优质解答
答案和解析
a1/2+a-1/2=3
平方
a+2+a-1=9
a+a-1=7
原式分母是立方差
=( a1/2-a-1/2)(a+1+a-1)/( a1/2-a-1/2)
=a+1+a-1
=7+1
=8
平方
a+2+a-1=9
a+a-1=7
原式分母是立方差
=( a1/2-a-1/2)(a+1+a-1)/( a1/2-a-1/2)
=a+1+a-1
=7+1
=8
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