exponent
![100 - 20 + 30 - 50 + 201 100 - 20 + 30 - 50 + 201](https://tex.z-dn.net/?f=100+-+20+%2B+30+-+50+%2B+201)
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100+30+201-20-50
331-70
=261
331-70
=261
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