Thực hiện phép tính

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PHẦN II : TỰ LUẬN
Bài 1. Thực hiện phép tính:

a) $\frac{3}{5} + \frac{-1}{25} = \frac{7}{20}$
b) $\frac{2}{5} + \frac{1}{5} \cdot \left(\frac{-3}{4}\right)$
c) $\frac{5}{12} + \frac{4}{5} + \frac{-3}{4} = \frac{-1}{4}$
d) $\frac{1}{7} + \frac{6}{7} \cdot \left(\frac{1}{2} - \frac{1}{3}\right)$
e) $-\frac{1}{2} \left( \left(\frac{2}{3}\right)^{9} \cdot \left(\frac{2}{3}\right)^{7} + 5 + 6\right)$
f) $25 \cdot \left(-\frac{1}{5}\right)^{3} + \frac{1}{5} \cdot 2 \cdot \left(-\frac{1}{2}\right)^{2} - \frac{1}{2}$
g) $3 \cdot \left(-\frac{2}{3}\right)^{2} - 2 \cdot \left(-\frac{2}{3}\right) + 4 \cdot \left(-\frac{2}{3}\right)^{0}$
h) $\left(1 - \frac{12}{7}\right)^{2} + 8 \cdot (0,5)^{3} + (-1)^{2023}$
i) $0,1 \cdot \sqrt{225} - \sqrt{\frac{1}{4}}$
k) $\left(-\frac{1}{2}\right)^{2} - \sqrt{\frac{16}{25}} + \sqrt{81} \cdot \left(-\frac{2}{3}\right)^{2} - \frac{-1}{2} \cdot \sqrt{\frac{4}{9}}$