Question: User: 91-92too89-90with solutions
1. **Stating the problem:** Simplify the expression $$91 - 92 \times 89 - 90$$.
2. **Formula and rules:** According to the order of operations (PEMDAS/BODMAS), multiplication must be done before addition or subtraction.
3. **Intermediate work:**
Calculate the multiplication first:
$$92 \times 89 = 8188$$
Now substitute back:
$$91 - 8188 - 90$$
4. **Simplify step-by-step:**
$$91 - 8188 = -8097$$
Then:
$$-8097 - 90 = -8187$$
5. **Final answer:**
$$-8187$$
This means the value of the expression $$91 - 92 \times 89 - 90$$ is $$-8187$$.