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几道数学计算的化简题
(1)(a+1)(a-1)-(a+1)(a+1);
(2)1-1/2+1/3-1/4.
人气:493 ℃ 时间:2020-02-01 08:36:42
解答
(1)(a+1)(a-1)-(a+1)(a+1);
=a^2-1-(a^2+2a+1)
=-2a-2
(2)1-1/2+1/3-1/4.
=(12-6+4-3)/12
=7/12
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