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I'm not quite sure if this is what you mean but: 9/9=1 9+1=10 9/9=1 10*1=10 The whole thing: (9/9)*(9+(9/9))=10
67 minutes, or an hour and 7 minutes 10 kilometers / x hours = 9 kilometers/1 hour x hours = 10/9 hours = 1 1/9 hours
The two numbers 10 and -1: 10 × -1 = -10 10 + -1 = 10 - 1 = 9
16.199 = (1 x 10) + (6 x 1) + (1/10) + (9/100) + (9/1000)
If you mean 90 - 9/10, then the answer's 89 1/10. If you mean 90 - nine-tenths of 90 [90 - 9/10(90)], then the answer's 9.