题目内容
11+12+13+14+15=______×______.
11+12+13+14+15,
=(13-2)+(13-1)+13+(13+1)+(13+2),
=(13+13+13+13+13)+(2-2+1-1),
=13+13+13+13+13,
=13×5;
故答案为:13,5.
=(13-2)+(13-1)+13+(13+1)+(13+2),
=(13+13+13+13+13)+(2-2+1-1),
=13+13+13+13+13,
=13×5;
故答案为:13,5.
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