12.设数列{an},{bn}都是等差数列,若a1+b1=7,a3+b3=21,则a5+b5=______.
4.等差数列中,则
16.设等差数列的前项和为,若,则的最大值为____;
4.若{}为等差数列,是其前n项和,且S11=,{}为等比数列,·=,则的值为( )
35
∵{an},{bn}均是等差数列,根据等差数列的性质a1+a5=2a3,b1+b5=2b3,即a5=2a3-a1,b5=2b3-b1,∴a5+b5=2(a3+b3)-(a1+b1)=2×21-7=35.