化简求值(5y+1)(5y-1)-5(y+25y平方)其中 y=2/5

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化简求值(5y+1)(5y-1)-5(y+25y平方)其中y=2/5化简求值(5y+1)(5y-1)-5(y+25y平方)其中y=2/5化简求值(5y+1)(5y-1)-5(y+25y平方)其中y=2

化简求值(5y+1)(5y-1)-5(y+25y平方)其中 y=2/5
化简求值(5y+1)(5y-1)-5(y+25y平方)其中 y=2/5

化简求值(5y+1)(5y-1)-5(y+25y平方)其中 y=2/5
(5y+1)(5y-1)-5(y+25y平方)=25y平方-1-5y-125y平方=2-1-2-20=-21
平方差公式和去括号