Multipliziere die Summen aus.

1. $x\cdot\left(m+n\right)$

2. $-20\cdot\left(-5u+3v+3v-1{,}5w\right)$

3. $2{,}5\cdot\left(4x+2y\right)$

4. $6m\cdot\left(3m-1{,}5n-4\mathrm{mn}\right)$

5. $-3m\cdot\left(-m-n\right)$

6. $\dfrac34\cdot\left(\dfrac98a-\dfrac56b-\dfrac1{12}c\right)$

7. $\left(x-5\right)\cdot\left(x+\dfrac32\right)$

8. $\left(\dfrac23x-2\right)\cdot\left(x+3\right)$

9. $\left(\dfrac12x-\dfrac52\right)\cdot\left(x+5\right)$

10. $\dfrac32\cdot\left(x+4\right)\cdot\left(x+4\right)$

11. $\left(3-2x\right)\cdot\left(-2x+3\right)$

12. $\dfrac{x-5}1\cdot\left(2x+8\right)$

13. $\left(x+8\right)\cdot\left(\dfrac14x+1\right)$

14. $\left(1-\dfrac15x\right)\cdot\left(\dfrac25x+2\right)$

15. $\dfrac x2\cdot\left(2x-k\right)^2$

16. $-\dfrac18\cdot\left(4-2x\right)^2$

17. $x\cdot\left(x+3\right)\cdot\left(2x-5\right)$

18. $\left(x-1\right)^3$