问题 解答题
计算:
(1)(2×10-5-2÷(10-23     
(2)(x-
4
x
)•
2
x-2
答案

(1)原式=

1
4
×1010÷10-6

=

1
4
×1010×106

=0.25×1016

=2.5×1015

(2)原式=

x2-4
x
2
x-2

=

(x+2)(x-2)
x
2
x-2

=

2(x+2)
x

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