Tính, Tìm x

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**Bài toán 1: Tính**
a) \( \frac{3}{5} \left( \frac{2}{7} \right) \)
b) \( -\frac{7}{8} \left( -\frac{12}{5} \right) \)
c) \( -(-3) \cdot -\frac{1}{7} \)
d) \( \frac{1}{6} \)
e) \( \frac{3}{8} \cdot (0,15) \)
f) \( \frac{3}{4} \cdot -\frac{5}{3} \)
g) \( -\frac{8}{5} \left( -\frac{2}{4} \right) \)
h) \( \left( -\frac{1}{7} \right) \cdot \left( -\frac{1}{14} \right) \)
k) \( -4,5 \cdot \left( -\frac{2}{3} \right) \)

**Bài toán 2: Tính (h p lý n u có th)**
a) \( \frac{3}{7} - \frac{12}{15} \)
b) \( \frac{5}{8} - \frac{3}{4} - 1 \)
c) \( -\frac{1}{2} - \frac{3}{4} - \left( -\frac{1}{2} \right) \)
d) \( 2 - \frac{5}{2} \)
e) \( -5 + 2 - \frac{3}{8} \cdot \left( \frac{4}{5} + \frac{11}{30} \right) \)
f) \( \frac{2}{9} \cdot \left( \frac{5}{22} \right) - \left( \frac{1}{11} + \frac{2}{3} \right) \)

**Bài toán 3: Tìm x, bi t:**
a) \( \frac{7}{6} - \frac{3}{4} = \frac{5}{8} \)
b) \( \frac{4}{12} \)
c) \( \frac{11}{12} \left( 2 - \frac{5}{3} \right) \)
d) \( -\frac{1}{4} + \frac{1}{4} = -\frac{5}{8} \)