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VTMO 2019 — Grade 4 — semifinal Question 1

VTMO · VTMO 2019 — Grade 4 — semifinal

Question 1

Which calculation result is incorrect?
  1. $1\times1:1\times1=1$
  2. $2:2+2:2=2$
  3. $3\times3-3+3=3$
  4. $(4-4):4+4=4$
  5. $5+5\times(5-5)=5$