计算:
(1)1.23452+0.76552+2.469×0.7655=______;
(2)19492-19502+19512-19522+…+19972-19982+19992=______;
网友回答
解:(1)1.23452+0.76552+2.469×0.7655=(1.2345+0.7655)2=22=4;
(2)19492-19502+19512-19522+…+19972-19982+19992=19492+(19512-19502)+…(19992-19982)
=19492+1×3901+3905×1+…+3997×1
=19492+
=3897326,
故