一.解答题 19.计算:
21.(•上海)计算:
. 22.
23.(•江苏)计算:(1)
; (2)
.
20.化简:
24.
25.
27.
.
26.
28.(2006•宜昌)计算:()÷. 29.
.
30.(2006•南充)计算:﹣x﹣2)
x21x2xx22x1231.(•眉山)计算: 2 32.(•宜昌)化简:
x1x2x1x1x21(ab)22ab11a2a22)236.(•福州)化简:2 37.化简:( 22a1a1a1abab2n1n212x1x2n)38.(•青岛)化简:( 39.化简:( x1)2nnx1x2x1m2162m11(1) 240.(•泸州)化简:2()
m1m2m1m6m9m3m341.(•扬州)化简:
aa1152a4 ()(a2)•a23aa21a1a11m24a22aa21)21)43.(•广西)化简:( 44. (1 m1mma2a1a18y26y9)45.(•成都)化简: ( 46. (y1 )a2a24a2y1y2y47.(•南京)计算:(
21a2a2a4a2) 48.
a1a21a22a1a2b2a2abab
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