已知输入一个等差数列的首项a1,第n项an,以及n的值,编写程序输出公差d及其前n项和Sn
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已知输入一个等差数列的首项a1,第n项an,以及n的值,编写程序输出公差d及其前n项和Sn
用c++编写程序
用c++编写程序
![已知输入一个等差数列的首项a1,第n项an,以及n的值,编写程序输出公差d及其前n项和Sn](/uploads/image/z/18468424-64-4.jpg?t=%E5%B7%B2%E7%9F%A5%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E7%9A%84%E9%A6%96%E9%A1%B9a1%2C%E7%AC%ACn%E9%A1%B9an%2C%E4%BB%A5%E5%8F%8An%E7%9A%84%E5%80%BC%2C%E7%BC%96%E5%86%99%E7%A8%8B%E5%BA%8F%E8%BE%93%E5%87%BA%E5%85%AC%E5%B7%AEd%E5%8F%8A%E5%85%B6%E5%89%8Dn%E9%A1%B9%E5%92%8CSn)
vb的话
private sub command1_click()
dim a1 as single,an as single,n as single,d as single,Sn as single
a1=text1.text
an=text2.text
n=text3.text
d=(an-a1)/n+1
Sn=(a1+an)*d/2
print "d=";d
print "Sn=";Sn
end su
private sub command1_click()
dim a1 as single,an as single,n as single,d as single,Sn as single
a1=text1.text
an=text2.text
n=text3.text
d=(an-a1)/n+1
Sn=(a1+an)*d/2
print "d=";d
print "Sn=";Sn
end su
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