四年级奥数巧算乘除法124x25二多少? 四年级奥数巧算乘除法128809÷230
\u56db\u5e74\u7ea7\u5965\u6570\u5de7\u7b97\u4e58\u9664\u6cd5124x25\u4e8c\u591a\u5c11124\u00d725=\uff08100+20+4\uff09\u00d725=100x25+20x25+4x25=2500+500+100=3100
128800\u00f7230
=\uff0840\u00d710\u00d7322\uff09\u00f7\uff0823\u00d710\uff09
=\uff0840\u00d710\u00d714\u00d723\uff09\u00f7\uff0823\u00d710\uff09
=\uff0840\u00d714\uff09\u00d7\uff0823\u00d710\uff09\u00f7\uff0823\u00d710\uff09
=560\u00d71
=560
=31X4X25
=31X100
=3100
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