有关三年级的计算类试题
比较345×347和346×346两个算式，哪个算式的乘积大？
答案：比较这两个算式的乘积的大小时，不必乘出结果来，再比较积的大小。我们只要把算式变化一下，就能得出结果来。
345×347=345×(346+1)=345×346+345
346×346=(345+1)×346=345×346+346
上面两式的结果中345×346的`积是相等的。一个式子加上345，另一个式子加上346，那当然是加上346的大了。因此346×346的积比345×347的积大。
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