原式=(a-1)/(a+1)(a-1)+2/(a+1)(a-1)
=(a-1+2)/(a+1)(a-1)
=(a+1)/(a+1)(a-1)
=1/(a-1)
原式=(x²+xy-xy+y²)/(x+y)(x-y)
=(x²+y²)/(x²-y²)
计算题:1.1/a+1—2/1-a² 2.x/x-y—y/x+y
计算题:1.1/a+1—2/1-a² 2.x/x-y—y/x+y
数学人气:490 ℃时间:2020-04-15 17:07:51
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