如题所述
90X46
=(100-1)X46
=100X46-1X46
=4600-46
=4554
=(100-1)X46
=100X46-1X46
=4600-46
=4554
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第1个回答 2011-10-28
28(93-2*46)=28(93-92)=28*1=28 28*(93-2*46)=28*(93-92)=28*1=28