It's about 400 mm rain in this area a year A、above all B、of all C、on average D、for average

相关推荐

• 1.This is Lucy's book.please give( ).A.back it for her B.it back for her C.it back to her D.back it to her2.Our city is becoming( )A.more and much beautiful B.more and more beautiful C.much beautiful D.more beautiful and more 为什么?3.she ( )tell her father about it.A.daren't B.didn'tC.didn't dare to D.all the above 4.The trees prevent the rain( )the ground directly.A.from hitting B.hit C.hits D.hiting 需要解析5.( )did you buy the computer for?A.why B.what C
• It's about 400 mm rain in this area a year A、above all B、of all C、on average D、for average
• 已知x=1-根号2,y=根号2+1,求-x的平方+2xy-y的平方.
• 已知数列{an}的首项a1=1,且点An(an,an+1)在函数y=x/(x+1)的图像上.（1）求数列{an}的通项公式；（2）...已知数列{an}的首项a1=1,且点An(an,an+1)在函数y=x/(x+1)的图像上.（1）求数列{an}的通项公式；（2）若数列{bn}满足an乘bn=2^n,求数列{bn}的前n项和Sn的值.