1/ a) 3+\(\frac{2}{5}\) b) 4-\(\frac{5}{7}\) c) 1-(\(\frac{2}{5}+\frac{1}{3}\)) d) 4x\(\frac{3}{8}\) e) 3:\(\frac{1}{2}\) \(\frac{1}{2}:3\) 2/ 1 tam bai hinh chu nhat co chieu dai \(\frac{1}{2}\)m, chieu rong \(\frac{1}{3}\)m . chia tam bia do thanh3 phan bang nhau. tinh dien tich moi...
Đọc tiếp
1/ a) 3+\(\frac{2}{5}\) b) 4-\(\frac{5}{7}\) c) 1-(\(\frac{2}{5}+\frac{1}{3}\)) d) 4x\(\frac{3}{8}\) e) 3:\(\frac{1}{2}\) \(\frac{1}{2}:3\)
2/ 1 tam bai hinh chu nhat co chieu dai \(\frac{1}{2}\)m, chieu rong \(\frac{1}{3}\)m . chia tam bia do thanh3 phan bang nhau. tinh dien tich moi phan
Diện tích mỗi phần là:
1/2x1/3:3=1/18 (m2)
Đáp số:1/18 m2
\(3+\frac{2}{5}=\frac{15}{5}+\frac{2}{5}=\frac{17}{5}\)
\(4-\frac{5}{7}=\frac{28}{7}-\frac{5}{7}=\frac{23}{7}\)
\(1-\left(\frac{2}{5}+\frac{1}{3}\right)=1-\frac{11}{15}=\frac{4}{15}\)
\(4\times\frac{3}{8}=\frac{12}{8}=\frac{3}{2}\)