如题所述
5.5×9.8
=5.5×(10-0.2)
=5.5×10-5.5×0.2
=55-1.1
=53.9
=5.5×(10-0.2)
=5.5×10-5.5×0.2
=55-1.1
=53.9
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第1个回答 2010-09-14
5.5乘9.8
=5.5*(10-0.2)
=5.5*10-5.5*0.2
=55-1.1
=53.9
=5.5*(10-0.2)
=5.5*10-5.5*0.2
=55-1.1
=53.9
第2个回答 2010-09-14
(5+0.5)×(10-0.2)
=5(10-0.2)+ 0.5(10-0.2)
=50-1+4.9
=53.9
=5(10-0.2)+ 0.5(10-0.2)
=50-1+4.9
=53.9