II. Phần tự luận (7,0 điểm)

(2,0 điểm)

1.1. Thực hiện phép tính (hợp lí nếu có thể):

a) \(\frac{{14}}{{23}} \cdot \left( { - \frac{8}{{11}}} \right) + \frac{{14}}{{23}} \cdot \left( { - \frac{3}{{11}}} \right)\). 

b) \(9,51 \cdot \left( { - 14,75} \right) + 9,51 \cdot \left( { - 85,25} \right)\).

a) \(\frac{{14}}{{23}} \cdot \left( { - \frac{8}{{11}}} \right) + \frac{{14}}{{23}} \cdot \left( { - \frac{3}{{11}}} \right)\)

\( = \frac{{14}}{{23}} \cdot \left( { - \frac{8}{{11}} - \frac{3}{{11}}} \right)\)

\( = \frac{{14}}{{23}} \cdot \left( { - 1} \right)\)

\( = \frac{{ - 14}}{{23}} \cdot \)

b) \(9,51 \cdot \left( { - 14,75} \right) + 9,51 \cdot \left( { - 85,25} \right)\)

\( = 9,51 \cdot \left( { - 14,75 - 85,25} \right)\)

\( = 9,51 \cdot \left( { - 100} \right)\)

\( = - 951.\)