数学题若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .

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数学题若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .

数学题若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .
数学题若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .
若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .

数学题若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .若a+b=5,ab=3,则a2+b2= ;(a+1)(b+1)= .
a2+b2=19
(a+1)(b+1)=9

a2+b2= (a+b)^2-2ab=25-6=19
(a+1)(b+1)=ab+a+b+1=3+5+1=9

a2+b2=(a+b)2-2ab=25-6=19
(a+1)(b+1)=ab+a+b+1=5+3+1=9

a+b=5 (a+b)^2=25 a^2+2ab+b^2=25
ab=3 2ab=6
a^2+b^2=25-6=19
(a+1)(b+1)
=ab+a+b+1
=3+5+1
=9

a2+b2=(a+b)2-2ab=25-6=19
(a+1)(b+1)=ab+a+b+1=5+3+1=9