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/(a+1)^2+1/(a+1)^2
(最好写出过程)
参考答案:(1)a+1/a+1=1
(2)3(1-x)/x+1=......
(3)原式=1/(a+1)
急需!!!!!!...
计算:
(1) a/a+1+1/a+1
(2)3/x+1-3x/x+1
(3)a/(a+1)^2+1/(a+1)^2
(最好写出过程)
参考答案:(1)a+1/a+1=1
(2)3(1-x)/x+1=......
(3)原式=1/(a+1)