（3）106×5=530，
因?yàn)?30＞500，所以＞500；
（4）72×0=0，72+0=72，
因?yàn)?＜72，所以72×0＜72+0；（5）2千克-500克=2000克-500克=1500克，
因?yàn)?500克=1500克，所以2千克-500克=1500克；
（6）5噸+500千克=5000千克+500千克=5500千克，
7噸-700千克=7000千克-700千克=6300千克，
因?yàn)?500千克＜6300千克，所以5噸+500千克＜7噸-700千克．
故答案為：＜，=，＞，＜，=，＜．點(diǎn)評(píng)：此題考查算式和名數(shù)的大小比較，要根據(jù)實(shí)際情況，靈活的選用合適的方法解答．
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