91/100x+49/100(12-x)=10.2
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![91/100x+49/100(12-x)=10.2](/uploads/image/z/651581-53-1.jpg?t=91%2F100x%2B49%2F100%EF%BC%8812-x%EF%BC%89%3D10.2)
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91/100x+49/100(12-x)=10.2
91/100x+49/100(12-x)=10.2
91/100x+49/100(12-x)=10.2
91/100x+49/100(12-x)=10.2
91x+49(12-x)=1020
7x=72
x=10又2/7
91/100x+49/100(12-x)=10.2
(X+X)+(X-X)+(X*X)+(X/X)=100
91+(100-x)=(49+x)3-12
49+X=3(91+100-X)-12
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