3. 4. 10. [7]Exercise2. 91. 21. 60. 24. 96. 16. 36. [3] 8. 4a+4b. 4a−4b. 2a2+2b2. 2a2−2b2. 3ab+3c. 3ab−3c. 3c−3ab. ab+ac. ab−ac. 3ab+3ac. 3ab−3ac. 5ab2+5ac. 5ab2−5ac2. 5a2b2−5a2c. [5]Exercise3.