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a)
`9/2-3`
`=9/2-6/2`
`=3/2`
b)
`8/5xx25/12`
`=10/3`
c)
`4:3/7`
`=4xx7/3`
`=28/3`
a)2/5+3/10-1/2=7/10-1/2=2/10=1/5
b)8/11+8/33x3/4=8/11+2/11=10/11
c)7/9x3/14:5/8=1/6:5/8=8/30+4/15
d)5/12-7/32:21/16=5/12-1/6=3/12
nha
a) 2/5+3/10-1/2
= 4/10+3/10-5/10
= 2/10 = 1/5
b) 8/11+8/33x3/4
= 8/11+2/11
= 10/11
c) 7/9x3/14:5/8
= 1/6:5/8
= 1/6x8/5
=4/15
d) 5/12-7/32:21/16
= 5/12-7/32x16/21
= 5/12-1/6
= 5/12-2/12
= 3/12
\(2-\dfrac{5}{7}:\dfrac{9}{21}=2-\dfrac{5}{7}x\dfrac{7}{3}=2-\dfrac{35}{21}=2-\dfrac{5}{3}=\dfrac{2x3-5}{3}=\dfrac{1}{3}\)
13/32 + 3/21 + 1/4 + 19/32 + 18/21 + 45/60
= ( 13/32 + 19/32 ) + ( 3/21 + 18/21 ) + ( 1/4+ 45/60 )
= 32/32 + 21/21 + (1/4+3/4)
= 1+1+4/4
=1+1+1
=3
Chúc bạn học tốt :333
\(=\dfrac{5}{12}-\dfrac{7}{32}\cdot\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5}{12}-\dfrac{2}{12}=\dfrac{1}{4}\)
\(=\dfrac{5}{12}-\dfrac{13}{48}=\dfrac{20}{48}-\dfrac{13}{48}=\dfrac{7}{48}\)
5/12 - 7/32 : 21/26
=5/12- 13/48
= 20/48 - 13/48
= 7/48