\(\frac{1}{2}+\frac{8}{9}-\frac{1}{2}=\frac{8}{9}\)
1/2 + 8/9 - 1/2
9/18 + 16/18 - 1/2
25/18 - 1/2
25/18 -9/18
16/18
rút gọn: 16/18 = 8/9
\(\frac{1}{2}+\frac{8}{9}-\frac{1}{2}=\frac{25}{18}-\frac{1}{2}=\frac{8}{9}\)
k minh
\(\frac{1}{2}+\frac{8}{9}-\frac{1}{2}=\frac{8}{9}\)
1/2 + 8/9 - 1/2
9/18 + 16/18 - 1/2
25/18 - 1/2
25/18 -9/18
16/18
rút gọn: 16/18 = 8/9
\(\frac{1}{2}+\frac{8}{9}-\frac{1}{2}=\frac{25}{18}-\frac{1}{2}=\frac{8}{9}\)
k minh
bài 1 : tính phân số:
a) \(\frac{5}{7}+\frac{4}{9}=?;\frac{4}{5}-\frac{2}{3}=?;\frac{9}{11}+\frac{3}{8}=?;\frac{16}{25}-\frac{2}{5}=?\)=?
b)\(5+\frac{3}{5}=?;10-\frac{9}{16}=?;\frac{2}{3}-\left(\frac{1}{6}+\frac{1}{8}\right)=?\)
c)\(\frac{5}{7}+\frac{7}{6}=?;\frac{7}{12}+\frac{17}{18}=?;\frac{9}{8}+\frac{15}{32}=?;4+\frac{35}{45}=?\)
d)\(\frac{11}{4}-\frac{15}{16}=?;\frac{5}{6}-\frac{5}{8}=?;\frac{196}{64}-2=?;3-\frac{13}{9}=?\)
e)\(\frac{8}{5}+\frac{7}{6}+\frac{5}{9}-2=?;3-\frac{5}{6}-\frac{4}{9}+\frac{32}{24}=?\)
\(\frac{1}{1×2}+\frac{1}{2×3}\: +\frac{1}{3×4}\: +\frac{1}{4×5}+\frac{1}{5×6}\: +\frac{1}{6×7}+\frac{1}{7×8}+\frac{1}{8×9}\: =?\)
Đúng ghi Đ, sai ghi S vào chỗ chấm:
a) \(\frac{3}{7}+\frac{1}{3}x\frac{3}{7}=\frac{16}{21}x\frac{3}{7}=\frac{16}{49}\) ......
b)\(\frac{5}{9}+\frac{1}{5}x\frac{5}{6}=\frac{5}{9}x\frac{1}{6}=\frac{13}{18}\) ......
c)\(\frac{13}{9}-\frac{7}{9}:\frac{2}{3}=\frac{6}{9}:\frac{3}{2}=1\) ......
d)\(\frac{11}{8}-\frac{5}{8}:\frac{3}{4}=\frac{11}{8}-\frac{5}{8}x\frac{4}{3}=\frac{11}{8}-\frac{10}{24}=\frac{23}{24}\) ......
Tính nhanh
a) \(\frac{2}{3}\div\frac{4}{9}+\frac{1}{3}\div\frac{4}{9}=\)
b) \(\frac{9}{8}\div\frac{5}{7}-\frac{1}{8}\div\frac{5}{7}=\)
c) \(\frac{2}{5}\div\frac{7}{3}-\frac{2}{5}\div\frac{1}{3}=\)
d) \(\frac{3}{7}\div\frac{7}{3}+\frac{3}{7}\div\frac{9}{4}=\)
Bài 1: Tính
a) \(\frac{3}{15}+\frac{2}{5}\)
b) \(\frac{9}{8}-\frac{5}{6}\)
c)\(\frac{1}{2}+\frac{3}{7}+\frac{11}{14}\)
d) \(\frac{8}{3}-\frac{1}{2}-1\)
\(\frac{1}{5}+\frac{4}{9}+\frac{2}{7}+\frac{8}{9}\)\(=?\)
Bài 1 :
a) Viết các phân số sau theo thứ tự từ lớn đến bé
\(\frac{3}{5};\frac{3}{6};\frac{3}{7}\)
b) Viết các phân số sau theo thứ tự từ bé đến lớn
\(\frac{8}{2};1;\frac{2}{4};\frac{5}{2};\frac{1}{2}\)
Bài 2 : So sánh
a. \(\frac{7}{8}...\frac{8}{9}\)
b. \(\frac{4}{6}...\frac{7}{8}\)
a) \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}\) b) \(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}+\frac{1}{729}\)
c) \(\frac{1}{5}+\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+...............+\frac{1}{1280}\) d) \(\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{96}+\frac{2}{192}\)
e) \(1+\frac{5}{4}+\frac{5}{8}+\frac{5}{16}+\frac{5}{32}+\frac{5}{64}\) f) \(\frac{3}{2}+\frac{3}{8}+\frac{3}{32}+\frac{3}{128}+\frac{3}{512}\)
g) \(3+\frac{3}{5}+\frac{3}{25}+\frac{3}{125}+\frac{3}{625}\)
Tính bằng cách thuận tiện
a) \(\frac{3}{5}+\frac{4}{7}+\frac{2}{5}+\frac{1}{7}+\frac{2}{7}\) b) \(\frac{4}{9}+\frac{8}{9}+\frac{12}{9}+\frac{16}{9}+........+\frac{48}{9}+\frac{52}{9}+\frac{56}{9}\)
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