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.