(a+b)^2=13,(a-b)^2=11,则ab的值为多少
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(a+b)^2=13,(a-b)^2=11,则ab的值为多少
(a+b)^2=13,(a-b)^2=11,则ab的值为多少
(a+b)^2=13,(a-b)^2=11,则ab的值为多少
(a+b)^2=13,(a-b)^2=11
(a+b)^2-(a-b)^2
=(a+b+a-b)(a+b-a+b)
=2a*2b
=4ab=13-11=2
ab=1/2