56+24−3.7556+24-3.7556+24−3.75
9x2+72x+1449x^2+72x+1449x2+72x+144
r5−2r6−r+1r2−1\frac{r^5-2r^6-r+1}{r^2-1}r2−1r5−2r6−r+1
i0i ^ { 0 }i0
4y2−20y2+254y^2-20y^2+254y2−20y2+25
612⋅3126^{12}\cdot3^{12}612⋅312
−9x+16+81-9x+16+81−9x+16+81
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