800/x(100-x)=1800/100-x
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800/x(100-x)=1800/100-x800/x(100-x)=1800/100-x800/x(100-x)=1800/100-x8/x(100-x)=18/(100-x)18x=8x=4/9
800/x(100-x)=1800/100-x
800/x(100-x)=1800/100-x
800/x(100-x)=1800/100-x
8/x(100-x)=18/(100-x)
18x=8
x=4/9
（X+X)+(X-X)+(X*X)+(X/X)=100
800/x(100-x)=1800/100-x
X+X-10+X+8=100
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