来自李玲玲的问题
1997×0.71+11×714+2222×0.29=______．
1997×0.71+11×714+2222×0.29=______．
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2020-04-07 23:35
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李军梅
1997×0.71+11×714+2222×0.29=1997×0.71+11×7.25+2222×0.29=1997×0.71+11×7.25+1997×0.29+225×0.29=1997×（0.71+0.29）+225×0.29+10×7.25+7.25=1997×（0.71+0.29）+225×0.29+72.5+0.29×25=1997+72.5+...
2020-04-07 23:39:00