Add vectors $\frac{30}{{?}_{45}}+\frac{100}{{?}_{70}}+\frac{50}{{?}_{-}}30$

a$.\frac{98\mathrm{.}71}{{?}_{42\mathrm{.}41}}$

b$.\frac{133\mathrm{.}70}{{?}_{42\mathrm{.}41}}$

c$.\frac{133\mathrm{.}70}{{?}_{90\mathrm{.}17}}$

d$.\frac{98\mathrm{.}69}{{?}_{91\mathrm{.}17}}$