6000÷25+6000÷15巧算方式?
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本题需要千万注意的是,没有“除法结合律”这个定律,所以说它=6000÷(25+15)=150这个是错误的,正确的有以下三种解法:
①解:6000÷25+6000÷15
=60x100÷25+100x60÷15
=60x(100÷25)+100x(60÷15)
=60x4+100x4
=(60+100)x4
=160x4
=640
②解:6000÷25+6000÷15
=6000÷(100÷4)+6000÷(60÷4)
=6000÷100x4+6000÷60x4
=60x4+100x4
=(60+100)x4
=160x4
=640
③解:6000÷25+6000÷15
=6000x(1/25)+6000x(1/15)
=6000x(1/25+1/15) 通分后,得:
=6000x(6/150+10/150)
=6000x(16/150)
=6000x16÷150
=6000÷150x16
=40x16
=640
①解:6000÷25+6000÷15
=60x100÷25+100x60÷15
=60x(100÷25)+100x(60÷15)
=60x4+100x4
=(60+100)x4
=160x4
=640
②解:6000÷25+6000÷15
=6000÷(100÷4)+6000÷(60÷4)
=6000÷100x4+6000÷60x4
=60x4+100x4
=(60+100)x4
=160x4
=640
③解:6000÷25+6000÷15
=6000x(1/25)+6000x(1/15)
=6000x(1/25+1/15) 通分后,得:
=6000x(6/150+10/150)
=6000x(16/150)
=6000x16÷150
=6000÷150x16
=40x16
=640
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