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Đúng ghi Đ, sai ghi S vào chỗ chấm:a) frac{3}{7}+frac{1}{3}xfrac{3}{7}frac{16}{21}xfrac{3}{7}frac{16}{49} ......b)frac{5}{9}+frac{1}{5}xfrac{5}{6}frac{5}{9}xfrac{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}xfrac{4}{3}frac{11}{8}-frac{10}{24}frac{23}{24} ......
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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)\(\frac{11}{8}-\frac{5}{8}:\frac{3}{4}=\frac{11}{8}-\frac{5}{8}x\frac{4}{3}=\frac{11}{8}-\frac{10}{24}=\frac{23}{24}\) ......
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}?
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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)\(\frac{8}{5}+\frac{7}{6}+\frac{5}{9}-2=?;3-\frac{5}{6}-\frac{4}{9}+\frac{32}{24}=?\)
1) Tính A biết rằng :A frac{1}{2}+frac{1}{4}+frac{1}{8}+frac{1}{16}+......+frac{1}{64}2) So sánh 2 phép tính sau: frac{1+2+3+4+5+6+7}{2+3+4+5+6+7+8}và frac{1}{2}+frac{2}{3}+frac{3}{4}+frac{6}{5}+frac{7}{6}+frac{8}{7}3) Tìm xbiết:frac{xtimes7}{x}7 frac{x}{xtimes6}frac{1}{6}4) Tìm 1 phân số nếu lấy frac{12}{5}trừ đi phân số đó rồi chia cho frac{5}{7}thì được frac{12}{5}.
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1) Tính A biết rằng :
A = \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+......+\frac{1}{64}\)
2) So sánh 2 phép tính sau:
\(\frac{1+2+3+4+5+6+7}{2+3+4+5+6+7+8}\)và \(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+\frac{6}{5}+\frac{7}{6}+\frac{8}{7}\)
3) Tìm \(x\)biết:
\(\frac{x\times7}{x}=7\) \(\frac{x}{x\times6}=\frac{1}{6}\)
4) Tìm 1 phân số nếu lấy \(\frac{12}{5}\)trừ đi phân số đó rồi chia cho \(\frac{5}{7}\)thì được \(\frac{12}{5}\).
a) x +\(\frac{4}{5}\)= \(\frac{4}{5}+\left(\frac{3}{7}+\frac{3}{5}\right)\) b) \(\frac{4}{9}+\frac{8}{9}+\frac{12}{9}+\frac{16}{9}+...+\frac{48}{9}+\frac{52}{9}+\frac{56}{9}\)
AI TRẢ LỜI NHANH NHẤT MK TÍCH CHO <3333
frac{4}{5}x frac{8}{3} xfrac{x}{7} frac{96}{105}frac{7}{4}x frac{3}{x} xfrac{11}{5} frac{231}{200} de bai la tim xfrac{3}{4} -frac{2}{5}+ frac{5}{12} frac{15}{7} -frac{4}{3} - frac{2}{9} frac{4}{5}- { frac{6}{15} +frac{1}{5} }frac{1}{2}_frac{1}{3} +frac{1}{4} - frac{1}{6} de bai la tinh
Đọc tiếp
\(\frac{4}{5}\)x \(\frac{8}{3}\) x\(\frac{x}{7}\) =\(\frac{96}{105}\)
\(\frac{7}{4}\)x \(\frac{3}{x}\) x\(\frac{11}{5}\) =\(\frac{231}{200}\)
de bai la tim x
\(\frac{3}{4}\) -\(\frac{2}{5}\)+ \(\frac{5}{12}\)
\(\frac{15}{7}\) -\(\frac{4}{3}\) - \(\frac{2}{9}\)
\(\frac{4}{5}\)- { \(\frac{6}{15}\) +\(\frac{1}{5}\) }
\(\frac{1}{2}\)_\(\frac{1}{3}\) +\(\frac{1}{4}\) - \(\frac{1}{6}\)
de bai la tinh
Tính bằng cách thuận tiện nhất .
\(\frac{39}{16}:\frac{5}{8}-\frac{17}{16}:\frac{5}{18}+\frac{4}{5}\)
\(\frac{16}{17}x\frac{12}{19}+\frac{16}{17}x\frac{7}{19}-\frac{2}{3}\)
1. Tính nhanhfrac{1}{2}x frac{2}{3}x frac{3}{4}xfrac{4}{5}x frac{5}{6}xfrac{6}{7}x frac{6}{7}x frac{7}{8}xfrac{8}{9}text{ }x frac{9}{10}frac{1}{2}: frac{3}{2}: frac{5}{4}frac{6}{5}:frac{7}{6}:frac{8}{7}
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1. Tính nhanh
\(\frac{1}{2}\)x \(\frac{2}{3}\)x \(\frac{3}{4}\)x\(\frac{4}{5}\)x \(\frac{5}{6}\)x\(\frac{6}{7}\)x \(\frac{6}{7}\)x \(\frac{7}{8}\)x\(\frac{8}{9}\text{ }\)x \(\frac{9}{10}\)
\(\frac{1}{2}\): \(\frac{3}{2}\): \(\frac{5}{4}\)\(\frac{6}{5}\):\(\frac{7}{6}\):\(\frac{8}{7}\)
lam theo mau:\(\frac{7}{8}\)x\(\frac{4}{7}\)x\(\frac{5}{4}\)=\(\frac{5}{8}\)
\(\frac{25}{32}\)x\(\frac{8}{50}\)x\(\frac{4}{3}\)x\(\frac{5}{10}\)=.............
tính bằng hai cách
a) \(\left(\frac{6}{11}+\frac{5}{11}\right)x\frac{3}{7}\) b) \(\frac{3}{5}x\frac{7}{9}+\frac{3}{5}x\frac{2}{9}\)
c) \(\left(\frac{6}{7}-\frac{4}{7}\right):\frac{2}{5}\) d) \(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}\)
giúp mik nha