207乘以101怎么用定律巧算 101x56-56怎样巧算?
3.92\u4e58\u4ee5101\u53ef\u4ee5\u8fd0\u7528\u4ec0\u4e48\u65b9\u6cd5\u6765\u5de7\u7b973.92\u4e58\u4ee5101\u53ef\u4ee5\u8fd0\u7528\uff08\u4e58\u6cd5\u5206\u914d\u5f8b\uff09\u6765\u5de7\u7b97
3.92\u00d7101
\uff1d3.92\u00d7\uff08100+1\uff09
\uff1d3.92\u00d7100+3.92\u00d71
\uff1d392+3.92
\uff1d395.92
\uff08101-1\uff09\u4e58\u4ee556\u7b49\u4e8e100\u4e58\u4ee556\uff1d5600
207×101=207×(100+1)
=207×100+207×1
=20700+207
=20907
(10000-3967-967)*101=(10000-(3967+967))*(100+1)=(10000-4934)*(100+1)=5066*(100+1)=506600+5066=511666
等于100X207+1X207=20907
绛旓細8.9脳101 =8.9x(100+1)=890+8.9 =898.9
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