$\text{a)}32xy+48xz-16xm=16x\left(2y+3z-m\right)$   

---

$\text{b)}30xy+20ay+10by=10y\left(3x+2a+b\right)$  

---

$\text{c)}-0,2xyz+0,6xy-0,4x=-0,2x\left(yz-3y+2\right)$  

---

$\text{d)}-3k^{2}t-3k^{3}t-3k^2{t}^2=-3k^{2}t\left(1+k+t\right)$