c) 13/27 + x/27 = 21/9 d) 5/9 : 3/x = 5/3
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20 tháng 5 2022
2/3 + 3/4=17/12
9/4 + 3/5=57/20
5/24 + 1/4=11/24
3/15 - 5/35=2/35 18/27 - 2/6=1/3 37/12 - 3=1/12
11/9 x 3/22=1/6 7/13 x 13/7=1 4 x6/7=24/7
2/5 : 3/10=4/3 3/8 : 9/4=1/6 8/21 : 4/7=2/3
10 tháng 7 2023
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
10 tháng 7 2023
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
30 tháng 7 2021
a) 3 x X x 2/3 = 4/5
3.x=6/5
x=2/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
=18,24(3,94+3,72+2,34)
=18,24.10
=182,4
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
=8/19(2/7+1/7+4/7)
=8/19.1
=8/19
\(c)\dfrac{13}{27}+\dfrac{x}{27}=\dfrac{21}{9}\)
\(\dfrac{x}{27}=\dfrac{21}{9}-\dfrac{13}{27}\)
\(\dfrac{x}{27}=\dfrc{50}{27}\)
\(x=50\)
_______________________________________________
\(d)\dfrac{5}{9}:\dfrac{3}{x}=\dfrac{5}{3}\)
\(\dfrac{3}{x}=\dfrac{5}{9}:\dfrac{5}{3}\)
\(\dfrac{3}{x}=\dfrac{1}{3}\)
\(\dfrac{3}{x}=\dfrac{3}{9}\)
\(x=9\)
`13/27 + x/27 = 21/9`
`13/27 + x/27 = 7/3`
`x/27=7/3-13/27`
`x/27 = 63/27 - 13/27`
`x/27 = 50/27`
`=> x=50`
_______________________
`5/9 : 3/x = 5/3`
`3/x=5/9 : 5/3`
`3/x = 5/9 xx 3/5`
`3/x = 1/3`
`=> x= 3 : 1/3`
`x=3 xx 3`
`x=9`