问题 填空题

计算:

(1)3+5+7+9+…+73+75=______;

(2)8888×1111+4444×7778=______.

答案

(1)(75-3)÷2+1=37,

(3+75)×37÷2,

=78×37÷2,

=1443;

(2)8888×1111+4444×7778,

=4444×2222+4444×7778,

=4444×(2222+7778),

=4444×10000

=44440000;

故答案为:1443,44440000.

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