10-4(x-1)\2(x-1)
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10-4(x-1)\2(x-1)
10-4(x-1)\2(x-1)
10-4(x-1)\2(x-1)
(x-1)可以先消去,4/2=2
所以原式=10-2=8
10-4(x-1)\2(x-1)
=10-1/2
=9又1/2
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