(3a/a-1减2/a+1)*a平方-1/2
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(3a/a-1减2/a+1)*a平方-1/2
(3a/a-1减2/a+1)*a平方-1/2
(3a/a-1减2/a+1)*a平方-1/2
原式=[3a(a+1)-2(a-1)]/(a+1)(a-1)×(a+1)(a-1)/2
=[3a(a+1)-2(a-1)]/2
=(3a²+3a-2a+2)/2
=(3a²+a+2)/2
(3a/a-1减2/a+1)*a平方-1/2
=3a^2-2a-(1/2)
x1=(2+根号10)/6
x2=(2-根号10)/6
{ 3a/(a-1) - 2/(a+1) } * (a^2 - 1) /2
= { 3a(a+1) - 2(a-1) } / (a+1)(a-1) } * (a+1)(a-1) / 2
= { 3a^2+3a - 2a+2 } / 2
= ( 3a^2+a+2 ) / 2
(3a/(a-1)-2/(a+1))(a²-1)/2
=((3a(a+1)-2(a-1))/(a-1)(a+1))(a²-1)/2
=((3a²+3a-2a+2)/(a²-1))(a²-1)/2
=(3a²+a+2)/2
是a-1分之3a减去a+1分之2的差再乘以a分之a²-1 其中a=2
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(3a/(a-1)-2/(a+1))(a²-1)/2
=((3a(a+1)-2(a-1))/(a-1)(a+1))(a²-1)/2
=((3a²+3a-2a+2)/(a²-1))(a²-1)/2
=(3a²+a+2)/2
是a-1分之3a减去a+1分之2的差再乘以a分之a²-1 其中a=2
(3a/(a-1)-2/(a+1))(a²-1)/a
=((3a(a+1)-2(a-1))/(a-1)(a+1))(a²-1)/a
=((3a²+3a-2a+2)/(a²-1))(a²-1)/a
=(3a²+a+2)/a
=3a+1+2/a
=6+1+1=8
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