| 4x²-81z² | = | ||
| 4p²-25v² | = | ||
| 4b²-100y² | = | ||
| 36l²-100r² | = | ||
| 36v²-64p² | = | ||
| 25j²-64t² | = | ||
| 49c²-9k² | = | ||
| 49j²-144h² | = | ||
| 169g²-4h² | = | ||
| 4t²-25f² | = | ||
| 169x²-49w² | = | ||
| 81d²u²-16o² | = | ||
| 121c²s²-25p²t² | = | ||
| 169d²m²-100q² | = | ||
| 225p²-81k² | = | ||
| 196d²-49n² | = | ||
| 169m²-289k²s² | = | ||
| 100s²u²-121h² | = | ||
| w²-16e²g² | = | ||
| 4l²y²-9r² | = |