\(\frac{2}{2}+\frac{2}{5}=1+\frac{2}{5}=\frac{1}{1}+\frac{2}{5}=\frac{5}{5}+\frac{2}{5}=\frac{7}{5}.\)
\(\frac{2}{2}+\frac{2}{5}=\frac{10}{10}+\frac{4}{10}=\frac{14}{10}=\frac{7}{5}\)
Tính giá trị biểu thức:
\(A=\frac{\frac{16}{10}:\left(1\frac{3}{5}\times \frac{5}{4}\right)}{\frac{64}{100}-\frac{1}{25}}+\frac{\left(\frac{108}{100}-\frac{2}{25}\right):\frac{4}{7}}{\left(5\frac{5}{9}-2\frac{1}{4}\right)\times 2\frac{2}{17}}+\frac{3}{5}\times \frac{1}{2}:\frac{2}{5}\)
So sánh:\(\frac{\frac{\frac{1}{2}}{\frac{3}{4}}}{\frac{\frac{5}{6}}{\frac{7}{8}}}+\frac{\frac{\frac{8}{7}}{\frac{6}{5}}}{\frac{\frac{4}{3}}{\frac{2}{1}}}\) và\(\frac{\frac{\frac{1}{2}}{\frac{3}{4}}+\frac{\frac{8}{7}}{\frac{6}{5}}}{\frac{\frac{5}{6}}{\frac{7}{8}}+\frac{\frac{4}{3}}{\frac{2}{1}}}\)và \(\frac{\frac{\frac{1}{2}+\frac{8}{7}}{\frac{3}{4}+\frac{6}{5}}}{\frac{\frac{5}{6}+\frac{4}{3}}{\frac{7}{8}+\frac{2}{1}}}\)và\(\frac{\frac{\frac{1+8}{2+7}}{\frac{3+6}{4+5}}}{\frac{5+4}{\frac{6+3}{2+1}}}\)
{\(\frac{2}{15}+\frac{5}{3}-\frac{3}{5}\)} : {\(4\frac{2}{3}-2\frac{1}{5}\)}
{\(\frac{2}{1x3}+\frac{2}{3x5}.\).......\(+\frac{2}{19x21}\)} x {\(\frac{2}{21}x\frac{3}{8}-\frac{5}{2}:70\)}
B=\(\frac{5}{7}.\frac{14}{11}-\frac{5}{7}.\frac{5}{11}-\frac{5}{11}.\frac{2}{7}\)
C=\(1+\frac{2}{6}+\frac{2}{12}+\frac{2}{20}+\frac{2}{30}+\frac{2}{42}\)
D=\(\frac{0,75-0,6+\frac{3}{19}+\frac{3}{19}}{2,75-2,2+\frac{11}{19}+\frac{11}{91}}\)
Tính giá trị biểu thức sau :
\(A=\frac{\frac{16}{10}:\left(1\frac{3}{5}\times \frac{5}{4}\right)}{\frac{64}{100}-\frac{1}{25}}+\frac{\left(\frac{108}{100}-\frac{2}{25}\right):\frac{4}{7}}{\left(5\frac{5}{9}-2\frac{1}{4}\right)\times 2\frac{2}{17}}+\frac{3}{5}\times \frac{1}{2}:\frac{2}{5}\)
Tính nhanh phân số:
\(\frac{\frac{2}{7}+\frac{2}{5}+\frac{2}{17}-\frac{2}{293}}{\frac{5}{7}+1+\frac{5}{17}-\frac{5}{293}}\)
BÀI 2: tìm số hữu tỹ X , biết rằng
a,\(\frac{-3}{2}-2X+\frac{3}{4}=-2\)2
b, (\(\frac{-2}{3}x-\frac{3}{5}\))(\(\frac{3}{-2}-\frac{10}{3}\))=\(\frac{2}{5}\)
c,\(\frac{x}{2}-\left(\frac{3x}{5}-\frac{13}{5}\right)=-\left(\frac{7}{5}+\frac{7}{10}.x\right)\)
d,\(\frac{2x-3}{3}+\frac{-3}{2}=\frac{5-3x}{6}-\frac{1}{3}\)
e,\(\frac{2}{3x}-\frac{3}{12}=\frac{4}{5}-\left(\frac{7}{x}-2\right)\)
B=\(\frac{2-\frac{1}{5}+\frac{1}{2}-\frac{2}{4}}{3-\frac{1}{10}-\frac{5}{2}}\)
\(3\frac{1}{2}+4\frac{5}{7}-5\frac{5}{14}=?\)
\(4\frac{1}{2}+\frac{1}{2}:5\frac{1}{2}=?\)
\(A=\frac{5}{11x16}+\frac{5}{16x21}+\frac{5}{21x26}+....+\frac{5}{61x66}\)
\(C=\frac{2}{3x4}+\frac{2}{4x5}+....+\frac{2}{40x41}+\frac{2}{41x42}\)
Ai nhanh mk tik nha!!!
