x1+x2=5 x1x2=1 那2/x1+2/x2=多少?
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x1+x2=5 x1x2=1 那2/x1+2/x2=多少?
x1+x2=5 x1x2=1 那2/x1+2/x2=多少?
x1+x2=5 x1x2=1 那2/x1+2/x2=多少?
2/x1+2/x2
通分=2(x1+x2)/x1x2
=10.
10
10