八年级数学代数a^2/(a-1)-a
1)a^2/(a-1)-a-1
=a^2/(a-1)-(a+1)
=[a^2-(a+1)(a-1)]/(a-1)
=[a^2-(a^2-1)]/(a-1)
=1/(a-1)。
2)被除式=1/(a-2)+(a-1)(a+1)/[(a+2)(a-1)]
=1/(a-2)+(a+1)/(a+2)
=[(a+2)+(a+1)(a-2)]/[(a-2)(a+2)]
=[(a+2)+(a^2-a-2)]/[(a-2)(a+2)]
=a^2/;(a-2)(a+2)]
原式=a^2/[(a-2)(a+2)]*(a+2)^2/a^4=(a+2)/[(a-2)a^2]。全部
1)a^2/(a-1)-a-1
=a^2/(a-1)-(a+1)
=[a^2-(a+1)(a-1)]/(a-1)
=[a^2-(a^2-1)]/(a-1)
=1/(a-1)。
2)被除式=1/(a-2)+(a-1)(a+1)/[(a+2)(a-1)]
=1/(a-2)+(a+1)/(a+2)
=[(a+2)+(a+1)(a-2)]/[(a-2)(a+2)]
=[(a+2)+(a^2-a-2)]/[(a-2)(a+2)]
=a^2/;(a-2)(a+2)]
原式=a^2/[(a-2)(a+2)]*(a+2)^2/a^4=(a+2)/[(a-2)a^2]。收起