Question

72×156-56×72怎么简便运算?

Answer 1

72×156-56×72
=72×(156-56)
=72×100
=7200

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Answer 2

72×156-56×72
=72×（156-56）
=72×100
=7200

Answer 3

=72×（156-56）
=72×100
=7200