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1、等差数列练习一1 .在等差数列q中,若生=4, 4 = 2,则Q=()A. -1B. OC. 1D. 62 .已知数列“为等差数列,且4 =2, a2+a3 = 3 ,贝ijq+%+/=()A. 45B. 43C. 42D. 403 .记Sn为等差数列4,的前几项和,若3S3=S2+S4吗=2 ,贝IJ a5=()A-12B.-1OCJOD.124 .已知“是公差为1的等差数列,S”为%的前项和,S58=4S4,则OlO =( )A. B. C. 10D. 12225 .已知等差数列%中,aA +a4 =-,ai + a,则公差d =()6 66 .记S”为等差数列“的前项和,若%+%=24,
2、S6=48,则4的公差为(AlB.2CA0.87 .已知等差数列4的前项和为S“,且%=12, 2=0,若40,则S2。二()A420B.340C.-420D-3408 .等差数列“中,若 4+2=4,%+4o=36,则 SK)=.9 .设等差数列q的前项和为S“,若 =2%,则YL =.10 .设S 为等差数列4的前项和,若q=l,公差d = 2, Szl+2-S.=36,则=等差数列练习一1 .在等差数列4中,若=4, a4=2 ,则4= ( B )A. -1B. OC. 1D. 62 .已知数列4为等差数列,且4 =2, a2+a3 = l3 ,贝11% + %+必=(C )A. 45B
3、. 43C. 42D. 403 .记SfJ为等差数列q的前项和,若3S3=S2+S4,4=2,则G=( B )A-12B.-10C.10D.124 .已知q是公差为1的等差数列,S为的前项和,S8=4S4,则/ =(B )1719SCA. B. C. 10D. 12225 .已知等差数列为中,4+q=3%+6=,则公差d=( D ) 666 .记S”为等差数列,的前项和,若q+4=24,56=48,则/的公差为(C )AlB2CA0.87 .已知等差数列的前项和为S.,且为% = 12, 2=0,若4O,贝iJS2。=(D ) A420B.340C.-420.-3408 .等差数列4中,若 4+%=4,%+4。=36,贝 IJSK)=.(IOO)9 .设等差数列%的前项和为S“,若4=2%,则Yl =.()510 .设S 为等差数列4的前项和,若q=l,公差d = 2, S/2-Sff=36,贝IJZI =11 .设S”为等差数列的前项和,S2=S6, % = 1厕。5=.(-1)