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7/6 - 3/5 : 6
= 7/6 - 3/5 x 1/6
= 7/6 - 1/10
= 70/60 - 6/60
= 64/60
= 16/15
2/7 x 3 - y = 5/14
6/7 - y = 5/14
y = 6/7 - 5/14
y = 12/14 - 5/14
y = 7/14
a: =5/6(1/8+2/3)=5/6*19/24=95/144
b: =3/4(7/5-1/2)=27/40
c: =35/24*2/3=35/36
1 + 7 + 8
= 8 + 8
= 16
2 + 6 + 4 + 7
= 8 + 4 + 7
= 12 + 7
= 19
1 + 7 + 3 + 5
= 8 + 3 + 5
= 11 + 5
= 16
a: 2/3=1-1/3
5/6=1-1/6
3/4=1-1/4
1/3>1/4>1/6
=>-1/3<-1/4<-1/6
=>2/3<3/4<5/6
b: 7/15=21/45
5/3=75/45
24/45=24/45
mà 21<24<75
nên 7/15<24/45<5/3
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
2 + \(\dfrac{5}{6}\): 3
= 2 + \(\dfrac{5}{6}\) : \(\dfrac{3}{1}\)
= 2 + \(\dfrac{5}{6}\) \(\times\) \(\dfrac{1}{3}\)
= 2 + \(\dfrac{5}{18}\)
= \(\dfrac{2\times18}{18}\) + \(\dfrac{5}{18}\)
= \(\dfrac{36}{18}\) + \(\dfrac{5}{18}\)
= \(\dfrac{41}{18}\)
17/18 đúng không