Tính hợp lý
Làm đúng,tất cả tớ chấm 10 nhaa
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Bài tập 4. Tính hợp lý
a) \( \frac{1}{7} + \frac{1}{3} + \frac{1}{5} + \frac{1}{7} \)
b) \( \frac{3}{5} + \frac{7}{9} + \frac{2}{5} + \frac{3}{9} \)
c) \( 21 \left( \frac{1}{7} - \frac{1}{5} + \frac{19}{21} \right) \)
d) \( 46 \left( \frac{1}{2} - \frac{7}{23} - \frac{27}{46} \right) \)
e) \( 75 \left( \frac{1}{5} - \frac{3}{25} + \frac{8}{15} \right) \cdot \frac{1}{4} \)
f) \( -34 \left( \frac{1}{17} - \frac{5}{34} + \frac{1}{4} \right) \)
g) \( 45 \left( -\frac{3}{5} + \frac{8}{15} + \frac{7}{9} \right) \)
h) \( \left( \frac{11}{12} - \frac{1}{5} + \frac{1}{3} - \frac{1}{12} \right) \cdot \frac{2}{3} \)
i) \( \frac{5}{9} + \frac{14}{18} + \frac{4}{9} + \frac{2}{9} + \frac{1}{2007} \)
----- Nội dung ảnh -----
Bài tập 4. Tính hợp lý
a) \( \frac{1}{7} + \frac{1}{3} + \frac{1}{5} + \frac{1}{7} \)
b) \( \frac{3}{5} + \frac{7}{9} + \frac{2}{5} + \frac{3}{9} \)
c) \( 21 \left( \frac{1}{7} - \frac{1}{5} + \frac{19}{21} \right) \)
d) \( 46 \left( \frac{1}{2} - \frac{7}{23} - \frac{27}{46} \right) \)
e) \( 75 \left( \frac{1}{5} - \frac{3}{25} + \frac{8}{15} \right) \cdot \frac{1}{4} \)
f) \( -34 \left( \frac{1}{17} - \frac{5}{34} + \frac{1}{4} \right) \)
g) \( 45 \left( -\frac{3}{5} + \frac{8}{15} + \frac{7}{9} \right) \)
h) \( \left( \frac{11}{12} - \frac{1}{5} + \frac{1}{3} - \frac{1}{12} \right) \cdot \frac{2}{3} \)
i) \( \frac{5}{9} + \frac{14}{18} + \frac{4}{9} + \frac{2}{9} + \frac{1}{2007} \)