问题 填空题

6×491+3×491+491=______×491;

57×58+55×57-13×57=______×______.

答案

(1)6×491+3×491+491

=(6+3+1)×491

=10×491

=4910;

(2)57×58+55×57-13×57

=57×(58+55-13)

=57×100

=5700.

故答案为:10,57,100.

单项选择题
单项选择题