基础达标
1、D
2、A
3、(1)-4a²b/3d
(2)x+1/x-1
(3)-2/x+1
4、(1)b/8a
(2)x⁴y
(3)8b³/3x
(4)2c/a²
(5)-2m/7x
(6)x²/(x-1)(x+1)(x+2)
5、(1)-x²/y
(2)x¹⁵/y⁷
6、x²-1/x-1×x(x-1)/(x-1) ²=x/x-1=-2/-2-1=2/3
7、(1)(x+3)(x-2)/x-3×(x+2)(x-3)/x+3
=(x+2)(x-2)
=x²-4
(2)b(a-b)×a+b/(a+b)(a-b)
=b
综合提升
8、(1)a²+1/a=-3a/a=-3
(2)(a+1/a) ²-2=(-3) ²-2=9-2=7
(3)a⁴+2+1/a⁴-2=(a²+1/a²)²-2=7²-2=49-2=47