分式化简:(1)10a2+3a-4-a+1a-1+1(2)(a-b+4aba-b)(a+b-4aba+b)(3)3-x2x-4÷(x+2-5x-2)(4)先化简,再求值:a-ba+b÷a2+b2a2-b2-a+bab?a2b+ab2a2+b2,其中a,b满足a2+b2+a-4b+174=-数学
题文
分式化简: (1)
(2) (a-b+
(3)
(4)先化简,再求值:
|
答案
(1)原式=
=
=
=
=
=-
(2)原式=
(3)原式= |
题文
分式化简: (1)
(2) (a-b+
(3)
(4)先化简,再求值:
|
答案
(1)原式=
=
=
=
=
=-
(2)原式=
(3)原式= |