matlab中怎样设置精度?fei1 =[ 11/8-3/8*exp(1/5),130203070610171053/90071992547409920-23/20*exp(1/5),3/8*exp(1/5)-3/8*exp(3/10),23/20*exp(1/5)-23/20*exp(3/10)][ -15/4+15/4*exp(-1/50),-94841794966586911/9007199254740992+23/2*exp(-1/50),-15/4*exp(

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