1. (⁺2) + (⁻5) blank (⁺4) + 0 2. (⁻19) + (⁻9) blank (⁻10) + (⁻18) 3. (⁻8) – (⁻16) blank (⁺9) – (⁻19) 4. (⁺3)(⁻6) blank (⁻9)(⁺3) 5. (⁺90) / (⁺10) blank (⁻27) / (⁻3)
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what is this question this is studying platform .
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