Exercise 1A

1.

1. ${\displaystyle 9x}$
2. ${\displaystyle p-13}$
3. ${\displaystyle k-4m+4n}$
4. ${\displaystyle 0}$
5. ${\displaystyle r+2s-15t}$

2.

1. ${\displaystyle 4(x+2y)}$
2. ${\displaystyle 3(4a+5b-6c)}$
3. ${\displaystyle 12(6f+3g-4h)}$
4. ${\displaystyle p(p-q+r)}$
5. ${\displaystyle 12k(k+12m-6n)}$

3.

1. ${\displaystyle 28(x+y)}$
2. ${\displaystyle 7b+13c}$
3. ${\displaystyle -p+24q+33r}$
4. ${\displaystyle 2(5l+3w-h)}$
5. ${\displaystyle 2(w+2v)}$

4.

1. ${\displaystyle 2ab}$
2. ${\displaystyle km-mn}$
3. ${\displaystyle 2pq-sq}$
4. ${\displaystyle 4x+8}$
5. ${\displaystyle -2}$

5.

1. ${\displaystyle 6x^{3}y^{2}}$
2. ${\displaystyle 30a^{3}b^{3}c^{4}}$
3. ${\displaystyle k^{2}m^{2}n^{2}}$
4. ${\displaystyle 162p^{4}q^{4}r^{4}}$
5. ${\displaystyle 24r^{2}s^{2}t^{2}u^{2}}$

6.

1. ${\displaystyle {b} \over {c}}$
2. ${\displaystyle {e} \over {2f}}$
3. ${\displaystyle {x} \over {5}}$
4. ${\displaystyle 2a}$
5. ${\displaystyle {2} \over {pr}}$