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\(\frac{3}{4}\)x \(\frac{15}{7}\)+ \(\frac{6}{7}\)x \(\frac{6}{8}\)
= \(\frac{45}{28}\)+ \(\frac{9}{14}\)
= \(\frac{9}{4}\)
#Hoctot
\(\frac{3}{4}\times\frac{15}{7}+\frac{6}{7}\times\frac{6}{8}\)
\(=\frac{3}{4}\times\frac{15}{7}+\frac{6}{7}\times\frac{3}{4}\)
\(=\frac{3}{4}\times\left(\frac{15}{7}+\frac{6}{7}\right)\)
\(=\frac{3}{4}\times3\)
\(=\frac{9}{4}\)
Học tốt
a) \(\frac{-1}{4}.\frac{1}{3}=\frac{\left(-1\right).1}{4.3}\frac{-1}{12}\)
b) \(\frac{-2}{5}.\frac{5}{-9}=\frac{\left(-2\right).5}{5.\left(-9\right)}=\frac{-10}{-45}=\frac{-2}{-9}=\frac{2}{9}\)
c) \(\frac{-9}{11}.\frac{5}{18}=\frac{\left(-9\right).5}{11.18}=\frac{-45}{198}=\frac{-5}{22}\)
Kp nha!!!!
\(\left(a\right)\frac{9}{8}+\frac{15}{32}=\frac{36}{32}+\frac{15}{32}=\frac{36+15}{32}=\frac{51}{32}\)
\(\left(b\right)4+\frac{35}{45}=\frac{4}{1}+\frac{35}{45}=\frac{180}{45}+\frac{35}{45}=\frac{180+35}{45}=\frac{43}{9}\)
\(\left(c\right)\frac{11}{4}-\frac{15}{16}=\frac{44}{16}-\frac{15}{16}=\frac{44-15}{16}=\frac{29}{16}\)
\(\left(d\right)3-\frac{13}{9}=\frac{3}{1}-\frac{13}{9}=\frac{27}{9}-\frac{13}{9}=\frac{27-13}{9}=\frac{14}{9}\)
\(\left(e\right)\frac{5}{6}-\frac{5}{8}=\frac{20}{24}-\frac{15}{24}=\frac{20-15}{24}=\frac{5}{24}\)
\(\left(g\right)\frac{196}{64}-2=\frac{196}{64}-\frac{2}{1}=\frac{196}{64}-\frac{128}{64}=\frac{196-128}{64}=\frac{17}{16}\)
Mình đảm bảo đúng ! Chúc bạn học tốt!
a) \(\frac{9}{8}+\frac{15}{32}=\frac{36}{32}+\frac{15}{32}=\frac{51}{32}\)
b) \(4+\frac{35}{45}=4+\frac{7}{9}=\frac{36}{9}+\frac{7}{9}=\frac{43}{9}\)
c)\(\frac{11}{4}+\frac{15}{16}=\frac{44}{16}+\frac{15}{16}=\frac{59}{16}\)
d )\(3-\frac{13}{9}=\frac{27}{9}-\frac{13}{9}=\frac{14}{9}\)
e ) \(\frac{5}{6}+\frac{5}{8}=\frac{40}{48}+\frac{30}{48}\)\(=\frac{70}{48}\)
\(\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x...x\left(1-\frac{1}{2014}\right)\)
A = \(\frac{2}{3}x\frac{3}{4}x\frac{4}{5}x...x\frac{2012}{2013}x\frac{2013}{2014}\)
A = \(\frac{2x3x4x...x2012x2013}{3x4x5x...x2013x2014}\)
a = \(\frac{2}{2014}=\frac{1}{1007}\)
a)\(\frac{5}{6}-\frac{a}{b}+\frac{3}{4}=\frac{2}{3}\)
\(\frac{5}{6}-\frac{a}{b}=\frac{2}{3}-\frac{3}{4}\)
\(\frac{5}{6}-\frac{a}{b}=\frac{8}{12}-\frac{9}{12}\)
Đề câu a hình như sai bạn à .
\(\frac{1}{3}-\frac{1}{2}+\frac{a}{b}=\frac{1}{2}\)
\(\frac{2}{6}-\frac{3}{6}+\frac{a}{b}=\frac{1}{2}\)
Đề b cũng sai luôn .
À, Mình nghiên cứu ra cách giải rồi nè!
a) \(\frac{5}{6}\) + \(\frac{2}{3}\) = \(\frac{a}{b}\) + \(\frac{3}{4}\)
\(\frac{5}{6}\) + \(\frac{4}{6}\) = \(\frac{a}{b}\) + \(\frac{3}{4}\)
\(\frac{9}{6}\) - \(\frac{3}{4}\) = \(\frac{a}{b}\)
\(\frac{a}{b}\) = \(\frac{3}{4}\)
Câu b cũng tương tự vậy đó
a, 6/9+5/7+1/3=2/3+5/7+1/3=5/7+1=12/7
b, 17/7+6/5-20/14=17/7+6/5-10/7=6/5+1=11/5
c,2/5x1/4+3/4x2/5=2/5x(1/4+3/4)=2/5x1=2/5
d, 6/11:4/6+5/11:2/3=6/11:2/3+5/11:2/3=(6/11+5/11):2/3=3/2
nha
\(\frac{156}{6}\)= \(\frac{26}{1}\)= 26
\(9:\frac{3}{5}\cdot\frac{4}{15}=\frac{3}{5}\cdot\frac{4}{15}=\frac{4}{25}\)
\(\frac{156}{6}=26\)