计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)

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计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)解-0.4^(

计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)
计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)

计算:-0.4^(-2)+[(1/2)+(1/5)]^(-1)
解-0.4^(-2)+[(1/2)+(1/5)]^(-1)
=-1/0.4^(2)+[(5/10)+(2/10)]^(-1)
=-1/(2/5)^(2)+[(5/10)+(2/10)]^(-1)
=-1/(4/25)+[(7/10)]^(-1)
=-25/4+1/(7/10)
=-25/4+10/7
=-175/28+40/28
=-135/28