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III. Compute each without raising any number to a power.
26. 5t³-20t
27. 72v-8v³
28. 181²-2(m+3n)²
29. 16(p+2q)²-25r²
30. ¼c²+¹/100d²
31. 40²-20²
32. 90²-80²
33. 100²-70²
34. 70²-50²
35. 80²-40²​