Question

69+69×99的简便计算是什么？

Answer 1

69+69×99
=69×（1+99）
=69×100
=6900
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Answer 2

69+69×（100-1）
=69+6900-69
=6900

Answer 3

69+69×99
=69×(1+99)
=69×100
=6900