初2数学计算题!急需答案!急需!...计算: (1) a/a+1+1/a+1 (2)3/x+1-3x/x+1 (3)a/
2个回答
(1)a+1/a+1=1
(2)3(1-x)/x+1=.
(3)原式=1/(a+1)
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