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若等差数列{an}满足a2+S3=4,a3+S5=12,则a4+S7的值是( )...
若等差数列{an}满足a2+S3=4,a3+S5=12,则a4+S7的值是( )
A.20
B.36
C.24
D.72
考点分析:
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