RATIONAL NUMBERS

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Across
  1. 3. (x*y)+(x*z)=x(y+z)
  2. 4. x*y=y*x
  3. 5. x/0
  4. 7. 1.2*10^-4
  5. 9. reciprocal of one
  6. 10. x/y and y/x
Down
  1. 1. x+(y+z)=y+(x+z)
  2. 2. -70+?=0
  3. 6. additive identity
  4. 8. R-R=R