Rational number calculation (important process) (1)33.1-(22.9)+(10.5) (2)(-8)-(-15)+(-9)-(-12) (3)-2/3+(-1/6)-(-1/4)-1/2 (4)3/5-3/2+(-11/4)+13/4

1. Original formula = 10.2 + 10.5 = 20.7
2. The original formula = 7 + (- 9) + 12 = - 2 + 12 = 10

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