25分之1311×79.45+159×47.56+20分之1591×52.44的简便运算怎么做?
问题描述:
25分之1311×79.45+159×47.56+20分之1591×52.44的简便运算怎么做?
答
25分之1311=52.44 20分之1591=79.55
25分之1311×79.45+159×47.56+20分之1591×52.44
=52.44×79.45+159×47.56+52.44×79.55
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=15900