问题标题：
2.5*[1/(6.1-6.09)]和4.21*99+42.1*0.1怎么简算
问题描述：
2.5*[1/(6.1-6.09)]和4.21*99+42.1*0.1怎么简算
丁增喜回答：
2.5*[1/(6.1-6.09)]
=2.5*1/0.01
=2.5*100
=2500
4.21*99+42.1*0.1
=4.21*99+4.21*10*0.1
=4.21*99+4.21*1
=4.21*(99+1)
=4.21*100
=421
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