Tính hợp lí
----- Nội dung dịch tự động từ ảnh -----
Tính hợp lý
a) \( \frac{3}{14} : \frac{1}{28} - \frac{13}{21} = \frac{1}{18} + \frac{29}{42} : \frac{1}{28} - 8 \)
b) \( -1 \cdot \frac{5}{7} \cdot 15 + \frac{2}{7} \cdot (-15) + (-10) \cdot (-108) \cdot \left( \frac{2}{3} - \frac{4}{5} + \frac{1}{7} \right) \)
c) \( C = \frac{1}{100 \cdot 99} - \frac{1}{99 \cdot 98} - \ldots - \frac{1}{3 \cdot 2} - \frac{1}{2 \cdot 1} \)
d) \( \left( -\frac{1}{4} + \frac{7}{33} - \frac{5}{3} \right) - \left( -\frac{15}{12} + \frac{6}{11} - \frac{48}{49} \right) \)
Tính hợp lý
a) \( \frac{3}{14} : \frac{1}{28} - \frac{13}{21} = \frac{1}{18} + \frac{29}{42} : \frac{1}{28} - 8 \)
b) \( -1 \cdot \frac{5}{7} \cdot 15 + \frac{2}{7} \cdot (-15) + (-10) \cdot (-108) \cdot \left( \frac{2}{3} - \frac{4}{5} + \frac{1}{7} \right) \)
c) \( C = \frac{1}{100 \cdot 99} - \frac{1}{99 \cdot 98} - \ldots - \frac{1}{3 \cdot 2} - \frac{1}{2 \cdot 1} \)
d) \( \left( -\frac{1}{4} + \frac{7}{33} - \frac{5}{3} \right) - \left( -\frac{15}{12} + \frac{6}{11} - \frac{48}{49} \right) \)