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X1=[(90%X1%X2%X3)/(270%X1%X2%X3)]*(90%X1)*1% X2...

x1:x2:x3=(90-x1):(90-x2):(90-x3) 可以得到x1=x2=x3 带入题目多给式子中得到x1=x2=x3=30/101

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