0.9+1.9+29.9+399.9+4999.9簡算

0.9+1.9+29.9+399.9+4999.9簡算


0.9+1.9+29.9+399.9+4999.9=（0.9＋0.1－0.1）＋（1.9＋0.1－0.1）＋（29.9＋0.1－0.1）＋（399.9＋0.1－0.1）＋（4999.9＋0.1－0.1）=（1-0.1）+（2-0.1）+（30-0.1）+（400-0.1）+（5000-0.1）=1+2+30+400+5000-0….



17.23.37.57 .怎麼算


23-17=6
37-23=14
57-37=20
14-6=8
20-14=6
c-20=4
c=24
答案是57+24=91



6.17×41.9+6.71×57.1+6.71怎麼簡算


6.17×41.9+6.71×57.1+6.71=（6.71-0.54）x41.9+6.71×57.1+6.71x1=6.71x41.9-0.54x41.9+6.71×57.1+6.71x1=（41.9+57.1+1）x6.71-0.54x41.9=100x6.71-0.54x41.9=671-22.626=648.374

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