49×46.7+5.23×49+4.9可以怎样简算?
2020-06-12
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你的算式可以这样变换运算方式简算:
49×46.7+5.23×49+4.9
=49×46.7+5.23×49+49×0.1
=49×(46.7+5.23+0.1)
=49×(46.7+5.33)
=(50-1)×52.03
=50×52.03-52.03
=50×(50+2.03)-52.03
=50×50+50×2.03-50-2.03
=250+50×(2.03-1)-2.03
=250+50×(1+0.03)-2.03
=250+50+1.5-2.03
=300-0.43
=299+1-0.43
=299+0.57
=299.57
49×46.7+5.23×49+4.9
=49×46.7+5.23×49+49×0.1
=49×(46.7+5.23+0.1)
=49×(46.7+5.33)
=(50-1)×52.03
=50×52.03-52.03
=50×(50+2.03)-52.03
=50×50+50×2.03-50-2.03
=250+50×(2.03-1)-2.03
=250+50×(1+0.03)-2.03
=250+50+1.5-2.03
=300-0.43
=299+1-0.43
=299+0.57
=299.57
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