(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值

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(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值(a+b)(a+b)=7.(a-b)(a-b

(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值
(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值

(a+b)(a+b)=7.(a-b)(a-b)=4.求a*a+b*b,ab的值