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A = \(\left(6:\frac{3}{5}-1\frac{1}{6}\times\frac{6}{7}\right):\left(4\frac{1}{5}\times\frac{10}{11}+5\frac{2}{11}\right)\)
= \(\left(6\times\frac{5}{3}-\frac{7}{6}\times\frac{6}{7}\right):\left(\frac{21}{5}\times\frac{10}{11}+\frac{57}{11}\right)\)
= \(9:\left(\frac{42}{11}+\frac{57}{11}\right)\)
= 9 : \(\frac{99}{11}\)
= 9 : 9 = 1
^^ Học tốt!!!
\(\frac{11}{4}-x=\frac{24}{4}:\frac{34}{5}\)
\(\frac{11}{4}-x=\frac{23}{4}x\frac{5}{34}\)
\(x=\frac{115}{136}-\frac{1}{4}\)
\(x=\frac{81}{136}\)
A=(6 : 35−116 x 67) : (415 x 1011+5211)A=(6 : 35−116 x 67) : (415 x 1011+5211)
A=(6 : 35−76 x 67) : (215 x 1011+5711)A=(6 : 35−76 x 67) : (215 x 1011+5711)
A=(10−1) : (4211+5711)A=(10−1) : (4211+5711)
A=9 : 9A=9 : 9
A=1
Bài 2
a.8/15+7/4+7/15+5/4
=8/15+7/15+7/4+5/4
=15/15+12/4
=1+3
=4
b.98,54-(41,82-35,72)
=98,54-6,1
=92,44
a) \(\frac{1.3+3.5+5.7+7.9}{3.6+9.10+15.14+21.18}\)
= \(\frac{1.3+3.5+5.7+7.9}{1.3.2.3+3.5.2.3+5.7.2.3+7.9.2.3}\)
= \(\frac{1.3+3.5+5.7+7.9}{1.3.6+3.5.6+5.7.6+7.9.6}\)
= \(\frac{1.3+3.5+5.7+7.9}{6.\left(1.3+3.5+5.7+7.9\right)}=\frac{1}{6}\)
Dấu "." là dấu nhân cấp 2
b) \(\frac{1.2+2.3+3.4+4.5}{3.6+6.9+9.12+12.15}\)
= \(\frac{1.2+2.3+3.4+4.5}{1.2.3.3+2.3.3.3+3.4.3.3+4.5.3.3}\)
= \(\frac{1.2+2.3+3.4+4.5}{1.2.9+2.3.9+3.4.9+4.5.9}\)
= \(\frac{1.2+2.3+3.4+4.5}{9.\left(1.2+2.3+3.4+4.5\right)}=\frac{1}{9}\)
Dấu "." là dấu nhân cấp 2
c) \(\frac{0,3+\frac{3}{7}+\frac{3}{11}}{0,4+\frac{4}{7}+\frac{4}{11}}\)= \(\frac{\frac{3}{10}+\frac{3}{7}+\frac{3}{11}}{\frac{4}{10}+\frac{4}{7}+\frac{4}{11}}\)= \(\frac{3.\left(\frac{1}{10}+\frac{1}{7}+\frac{1}{11}\right)}{4.\left(\frac{1}{10}+\frac{1}{7}+\frac{1}{11}\right)}=\frac{3}{4}\)
a, \(\frac{5}{6}\) + \(\frac{7}{8}\) = \(\frac{5x8}{6x8}\) + \(\frac{7x6}{8x6}\) = \(\frac{40}{48}\) + \(\frac{42}{48}\) = \(\frac{82}{48}\) = \(\frac{41}{24}\)
b, \(4\frac{2}{3}\) x \(2\frac{3}{5}\) = \(\frac{4x3+2}{3}\) x \(\frac{2x5+3}{5}\) = \(\frac{14}{3}\) x \(\frac{13}{5}\) = \(\frac{14x13}{3x5}\) = \(\frac{182}{15}\)
c, \(4\frac{3}{4}\) - \(3\frac{2}{3}\) : \(\frac{11}{6}\) = \(\frac{4x4+3}{4}\) - \(\frac{3x3+2}{3}\) : \(\frac{11}{6}\) = \(\frac{19}{4}\) - \(\frac{11}{3}\) : \(\frac{11}{6}\) = \(\frac{19}{4}\) - \(\frac{11x6}{3x11}\) = \(\frac{19}{4}\) - \(\frac{66}{33}\) = \(\frac{19}{4}\) - \(\frac{2}{1}\) = \(\frac{19}{4}\) - \(\frac{2x4}{1x4}\) = \(\frac{19}{4}\) - \(\frac{8}{4}\) = \(\frac{11}{4}\)
Xong rồi bạn! Mong bạn phản hồi! Cảm ơn bạn! Chúc bạn học giỏi!
\(M=\frac{\frac{3}{5}+\frac{3}{7}-\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}=\frac{3\times\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}{4\times\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}=\frac{3}{4}\)
Bài làm:
Ta có: \(\frac{\frac{3}{5}+\frac{3}{7}-\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}\)
\(=\frac{3\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}{4\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}\)
Mà \(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}>0\)
\(\Rightarrow M=\frac{3}{4}\)