.\(\frac{1}{2}+\frac{2}{2}+\frac{3}{2}=\frac{1+2+3}{2}=\frac{6}{2}=3\)
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viết thêm 4 phân số\(\frac{1}{1};\frac{1}{2};\frac{2}{1};\frac{1}{3};\frac{2}{2};\frac{3}{1};\frac{...}{...};\frac{...}{...};\frac{...}{...};\frac{...}{...}\)
tính nhanh \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}}{\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+....+\frac{99}{100}}\)
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}+fr...
Đọc tiếp
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 nhanh:
\(\frac{2}{3}\times\frac{1}{2}+\frac{2}{3}\times\frac{1}{2}+\frac{1}{3}\)
\(\frac{75}{100}+\frac{18}{21}+\frac{19}{23}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}=\)
\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
\(\frac{2}{3\cdot5}+\frac{2}{5\cdot7}+\frac{2}{7\cdot9}+.....+\frac{2}{41\cdot43}\)
Bài 1 : tính theo cách hợp lý nhấtfrac{6}{11}+frac{1}{3}+frac{5}{11}Bài 2 : Tính bằng cách nhanh nhấtfrac{1}{2}+frac{1}{6}+frac{1}{12}+frac{1}{20}Bài 3 : Tính nhanha,frac{3}{2}timesfrac{4}{5}timesfrac{2}{3}b,frac{6}{7}timessubsetfrac{5}{3}timesfrac{7}{6}supsetBài 4 : Tính nhanha,frac{2}{5}timesfrac{1}{4}+frac{3}{4}timesfrac{2}{5}b,frac{6}{11}divfrac{2}{3}+frac{5}{11}divfrac{2}{3}
Đọc tiếp
Bài 1 : tính theo cách hợp lý nhất
\(\frac{6}{11}+\frac{1}{3}+\frac{5}{11}\)
Bài 2 : Tính bằng cách nhanh nhất
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}\)
Bài 3 : Tính nhanh
a,\(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{3}\)
b,\(\frac{6}{7}\times\subset\frac{5}{3}\times\frac{7}{6}\supset\)
Bài 4 : Tính nhanh
a,\(\frac{2}{5}\times\frac{1}{4}+\frac{3}{4}\times\frac{2}{5}\)
b,\(\frac{6}{11}\div\frac{2}{3}+\frac{5}{11}\div\frac{2}{3}\)
\(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{199}+\frac{1}{200}}{\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{192}{2}+\frac{199}{1}}\)
Tính nhanh giúp mình nha ! NHANH HẾT MỨC CÓ THỂ NHÉ
Bài 1:Tính nhanh:
a,\(\frac{2}{3}+\frac{4}{6}+\frac{6}{3}\)
b,\(\frac{3}{4}+\frac{6}{8}+\frac{18}{12}\)
Bài 2:Tính:
a,\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)
b,\(\frac{1}{2}+\frac{1}{3}+\frac{1}{5}+\frac{1}{7}\)
Tính bằng cáh thuân tiện nhất
1- (\(1-\left(\frac{1}{2}x\frac{3}{5}+\frac{1}{5}x\frac{1}{2}+\frac{2}{10}x\frac{1}{2}+\frac{1}{2}\right)\)