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An infinite number of ways.

.1+.9, .2+.8, .3+.7, .4+.6
then, .01+.99, .02+.98, .03+.97, ....
then, .001+.999, .002+.998

Then there are multiples:
1*1, 2*.5, etc

And that is only using binary operations. You could have .1+.1+.8, .1+.2+.7 (ternary operations), as well

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15y ago

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