2019年高考數(shù)學真題分類匯編 11.2 二項式定理 理考點二項式定理的應(yīng)用1.(xx湖北,2,5分)若二項式的展開式中的系數(shù)是84,則實數(shù)a=()A.2 B. C.1 D.答案C2.(xx四川,2,5分)在x(1+x)6的展開式中,含x3項的系數(shù)為()A.30 B.20 C.15 D.10答案C3.(xx湖南,4,5分)的展開式中x2y3的系數(shù)是()A.-20 B.-5 C.5 D.20答案A4.(xx浙江,5,5分)在(1+x)6(1+y)4的展開式中,記xmyn項的系數(shù)為f(m,n),則f(3,0)+f(2,1)+f(1,2)+f(0,3)=()A.45 B.60 C.120 D.210答案C5.(xx課標,13,5分)(x-y)(x+y)8的展開式中x2y7的系數(shù)為.(用數(shù)字填寫答案)答案-206.(xx課標,13,5分)(x+a)10的展開式中,x7的系數(shù)為15,則a=.(用數(shù)字填寫答案)答案7.(xx安徽,13,5分)設(shè)a0,n是大于1的自然數(shù),的展開式為a0+a1x+a2x2+anxn.若點Ai(i,ai)(i=0,1,2)的位置如圖所示,則a=.答案38.(xx山東,14,5分)若的展開式中x3項的系數(shù)為20,則a2+b2的最小值為.答案29.(xx大綱全國,13,5分)的展開式中x2y2的系數(shù)為.(用數(shù)字作答)答案70