1. **Stating the problem:** Calculate the product of the vectors or pairs given, starting with the first: $-(0,5) \times 1 \times 2 = 0,25$. 2. **Formula and rules:** Assuming the operation is multiplication of numbers or scalar multiplication of vectors, multiply each component or number step-by-step. 3. **Step-by-step calculation for the first problem:** - Given: $-(0,5) \times 1 \times 2$ - Multiply $1 \times 2 = 2$ - Then multiply $0,5 \times 2 = 1$ - Apply the negative sign: $-1$ 4. **Intermediate step with cancellation (if applicable):** - Here, no common factors to cancel, so no cancellation step. 5. **Final answer:** $$-1$$ Since the user asked to calculate "toto" (this), and multiple pairs are given, but per instructions, only the first problem is solved.