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问题: 初二数学

(100-10000/X)X=10000/X×200
求X=?

解答:

(100-10000/X)X = 10000/X × 200
--->(1-100/X)X = 20000/X
--->X-100=20000/X
--->X²-100X-20000 = 0
--->(X-200)(X+100) = 0
--->X=200或X=-100