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Yes. It's 0.009 cm more than 1.46 cm,and it's 0.001 cm less than 1.47 cm.
No 1dm=10cm.
Less. There are 100 centimeters in a meter, so 90 cm would be 10 cm less than a meter.
Much less than 2 km. 9000 cm is no more than 300 feet.
It's not totally clear what you meant to type, but I think you meant 1000-1 cm, which would be less than 10 cm; so the answer is no.