如题所述
3.85*99
=(4-0.15)*(100-1)
=400+4-15+0.15
=389.15
=(4-0.15)*(100-1)
=400+4-15+0.15
=389.15
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第1个回答 2014-06-18
3.85×99
=3.85×(100-1)
=3.85×100-3.85×1
=385-3.85
=381.15
=3.85×(100-1)
=3.85×100-3.85×1
=385-3.85
=381.15