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\(\dfrac{11}{2}\): \(\dfrac{1}{4}\) \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{11}{2}\) \(\times\) \(\dfrac{4}{1}\) \(\times\) \(\dfrac{5}{3}\)
= 22 \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{110}{3}\)
\(\dfrac{5}{2}-\dfrac{1}{4}+\dfrac{5}{3}\)
= \(\dfrac{30}{12}-\dfrac{3}{12}+\dfrac{20}{12}\)
= \(\dfrac{7}{12}\)
\(\dfrac{14}{5}\times\dfrac{2}{3}\)+ 5
= \(\dfrac{28}{15}\) + 5
= \(\dfrac{28}{15}\) + \(\dfrac{75}{15}\)
= \(\dfrac{103}{15}\)
b: =>x/23=1+3/4+4/7=65/28
=>x=23*65/28=1495/28
c: =>3/5:x=3/5-1/4-1/2=9/40
=>x=3/5:9/40=8/3
\(\left(\dfrac{6}{11}+\dfrac{5}{11}\right)\times\dfrac{3}{7}=\dfrac{11}{11}\times\dfrac{3}{7}=1\times\dfrac{3}{7}=\dfrac{3}{7}\)
\(\dfrac{3}{5}\left(\dfrac{7}{9}-\dfrac{2}{9}\right)=\dfrac{3}{5}\times\dfrac{5}{9}=\dfrac{1}{3}\)
a)\(\frac{3}{7}\times\frac{1}{3}+\frac{10}{7}=\frac{1}{7}+\frac{10}{7}=\frac{11}{7}\)
b)\(\frac{9}{5}-\left(\frac{27}{36}-\frac{4}{36}\right)=\frac{9}{5}-\frac{23}{36}=\frac{324}{180}-\frac{115}{180}=\frac{209}{180}\)
a)3/7: 3+5x2/7
=1/7+10/7
=11/7
b)9/5-(3/4-1/9)
=9/5-23/36
=209/180
a,4/5x2/9+1/5x2/9
=2/9*(4/5+1/5)
=2/9*1
=2/9
b)7/8:1/5-3/8:1/5
=(7/8-3/8):1/5
=1/2:1/5
=5/2
c)6/11x8/9+5/11x8/9
=(6/11+5/11)*8/9
=1*8/9
=8/9
d)11/12:2/3-3/12:2/3
=(11/12-3/12):2/3
=2/3:2/3
=1
MK sẽ giúp bn
a)\(\frac{4}{5}x\frac{2}{9}+\frac{1}{5}x\frac{2}{9}\)
\(=\left(\frac{4}{5}+\frac{1}{5}\right)x\frac{2}{9}\)
\(=1x\frac{2}{9}\)
\(=\frac{2}{9}\)
b)\(\frac{7}{8}:\frac{1}{5}-\frac{3}{8}:\frac{1}{5}\)
\(=\left(\frac{7}{8}-\frac{3}{8}\right):\frac{1}{5}\)
\(=\frac{5}{8}:\frac{1}{5}\)
\(=\frac{25}{8}\)
c)\(\frac{6}{11}x\frac{8}{9}+\frac{5}{11}x\frac{8}{9}\)
\(=\left(\frac{6}{11}+\frac{5}{11}\right)x\frac{8}{9}\)
\(=\frac{8}{9}x1\)
\(=\frac{8}{9}\)
d)\(\frac{11}{12}:\frac{2}{3}-\frac{3}{12}:\frac{2}{3}\)
\(=\left(\frac{11}{12}-\frac{3}{12}\right):\frac{2}{3}\)
\(=\frac{2}{3}:\frac{2}{3}\)
\(=1\)
3/4 x 1/2 x 4/5 x 2/3 : 1/5
=1/2 x 2/3 x 3/4 x4/5 : 1/5
=1 x 2 x 3 x 4 / 2 x 3 x 4 x 5 : 1/5
=1/5 : 1/5
=1
1= 2/3:3/4*3=8/3
2=1/8:5/6:1/3=9/20
3=2/5:6/5*2/3=2/9
Chúc bạn học tốt!
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