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Choose three numbers from the nine numbers of 1 to 9 in the second volume of mathematics in seventh grade. What did you find? Tell the truth.
Solutions; Let these three numbers be x, y, z y, z respectively, and six tens are; 10x+y, 10y+x, 10x+z, 10x+y, 10y+z 10z+X, the total is equal to 22 {x+.
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