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1 - 1 1 - 1
1 +1 2
= 1 - 1
1
2
= 1 - 1 ÷ 1
1 2
= 1 - 1 × 2
1 1
= 1 - 1 × 2
1
= 1 - 2
1
= 1 - 2
= - 1