问题 解答题
(1)计算2×(-3)+(-3)°-
4

(2)化简:(1+
1
m-1
m
m2-1
答案

(1)原式=-6+1-2=-7;

(2)原式=(

m-1
m-1
+
1
m-1
(m+1)(m-1)
m

=

m
m-1
×
(m+1)(m-1)
m

=m+1.

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