A.-1+2-3 | B.-1+2+3 | C.-1-2-3 | D.1+2-3 |
A.-3-8+9-11=-3-8+11-9 | B.-3+8-9-11=-11+3+8-9 |
C.-8+5-2+13=-8-2+5+13 | D.-8+5-2-13=-8+5+2-13 |
A.-5-(-7)+9=-5-7+9 | B.-5-(-9)-(-8)=-5+9+8 |
C.-5+(-7)-(-9)=-5-7-9 | D.-5-7-(-9)=-5+7+9 |
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