15.37*7.98-9.37*7.98+15.37*2.11-1.937*21.1
=(15.37-9.37)*7.98+(15.37-1.937)*2.11
=6*7.98+13.433*2.11
=47.88+28.34363
=76.22363
简算：15.37*7.98-9.37*7.98+15.37*2.11-1.937*21.1
3个回答
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