x2分之x1+x1分之x2-2 应该怎样通分?? 紧急!!!!速度!!

不是x1分之x2-2 是x1分之x2 再减2
2025-01-06 01:47:22
推荐回答(3个)
回答1:

x1^2/x1x2+x2^2/x1x2-2x1x2/x1`x2=(x1^2+x2^2-2x1x2)/x1x2
=[(x1+x2)^2]/x1x2

回答2:

x1/x2 +x2/x1 -2=(x1²+x2²-2x1x2)/x1x2=(x1+x2)²/x1x2

回答3:

x1/x2 +x2/x1 -2
=(x1²+x2²-2x1x2)/x1x2
=(x1+x2)²/x1x2