(780-724)×15怎样简便运算

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(780-724)×15怎样简便运算
(780-724)×15怎样简便运算

(780-724)×15怎样简便运算
(780-724)×15
=(80-24)×15
=8×(10-3)×15
=120×7
=840

=56×15
=56×(10+5)
=560+280
=840

(780-724)×15
=(56)×15
=(60-4)×15
=900-60
=840