①3.68×[1÷（2.10-2.09）]
=3.68×[1÷0.01]
=3.68×100
=368
②[34-0÷（17+213）]×12
=[34-0]×12
=34×12
=408
③（2.4×2
+0.1）÷10% 2 3
=（6.4+0.1）÷0.1
=6.5÷0.1
=65
④（1.75+
）×（59+41）1 2
=（1.75+
）×1001 2
=1.75×100+
×1001 2
=175+50
=225
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