tiinhs
3/5 + 10/25
2/5 x 5/4
1/4 + 9/28
15/16 x 4/5
5/6 - 13/30
2/5 : 8/15
20/27 : 5/9
42/54 - 2/9
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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
Tính các tổng sau:
1, S=1-2+3_4+..+25-26
S =-1+3-5+7-...-53+55 ( có 28 số hạng )
= (-1+3)+(-5+7)+...+(-53+55) ( có 28:2=14 nhóm )
= 2+2+...+2
= 2 . 14
= 28
`1/7+(-9/27)+10/7+(-4/7)`
`= (1/7 + (-4)/7+10/7) +(-9/27)`
`= 7/7 +(-9/27)`
`= 1 +(-9/27)`
`= 27/27 + (-9/27)`
`=18/27`
`=2/3`
__
`1,3 xx2 1/4 -1,3 xx3 1/4`
`= 1,3 xx 9/4 -1,3 xx 13/4`
`=1,3 xx (9/4-13/4)`
`=1,3xx(-4)/4`
`=1,3 xx (-1)`
`=-1,3`
__
`1/4: x = 2,4 -4/5`
`=> 1/4 : x= 12/5 -4/5`
`=> 1/4 : x=8/5`
`=> x=1/4 : 8/5`
`=> x= 1/4 xx 5/8`
`=> x= 5/32`
__
`5/4 ( x- 3/5)= -1/8`
`=> x-3/5 = -1/8 : 5/4`
`=> x-3/5 = -1/8 xx 4/5`
`=> x-3/5 =-4/40`
`=> x-3/5 =-1/10`
`=> x=-1/10 +3/5`
`=> x=-1/10 + 6/10`
`=> x= 5/10`
`=>x=1/2`
` @ yngoc`
1: x=3/4-1/2=3/4-2/4=1/4
2: x-1/5=2/11
=>x=2/11+1/5=21/55
3: x-5/6=16/42-8/56
=>x-5/6=8/21-4/28=5/21
=>x=5/21+5/6=15/14
4: x/5=5/6-19/30
=>x/5=25/30-19/30=6/30=1/5
=>x=1
5: =>|x|=1/3+1/4=7/12
=>x=7/12 hoặc x=-7/12
6: x=-1/2+3/4
=>x=3/4-1/2=1/4
11: x-(-6/12)=9/48
=>x+1/2=3/16
=>x=3/16-1/2=-5/16
1)x= 1/4
2)x= 2/11+ 1/5
x= 21/55
3)x - 5/6 = 5/21
x = 5/21+5/6
x = 15/14
4)x/5 = 5/6 + -19/30
x:5 = 1/5
x = 1/5.5
x = 1
5) |x| - 1/4 = 6/18
|x| = 6/18 - 1/4
|x| =7/12
⇒x= 7/12 hoặc -7/12
6)x = -1/2 +3/4
x= 1/4
7) x/15 = 3/5 + -2/3
x:15 = -1/15
x = -1/15. 15
x = -1
8)11/8 + 13/6 = 85/x
85/24 = 85/x
⇒ x = 24
9) x - 7/8 = 13/12
x = 13/12 + 7/8
x = 47/24
10)x - -6/15 = 4/27
x = 4/27 + (-6/15)
x = -34/135
11) -(-6/12)+x = 9/48
x= 9/48 - 6/12
x = -5/16
12) x - 4/6 = 5/25 + -7/15
x -4/6 = -4/15
x = -4/15 + 4/6
x = 2/5
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
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
\(\frac35+\frac{10}{25}=\frac35+\frac25=\frac55=1\)
\(\frac25\cdot\frac54=\frac{2\cdot5}{5\cdot4}=\frac{10}{20}=\frac12\)
\(\frac14+\frac{9}{28}=\frac{7}{28}+\frac{9}{28}=\frac{16}{28}=\frac47\)
\(\frac{15}{16}\cdot\frac45=\frac{15}{5}\cdot\frac{4}{16}=\frac34\)
\(\frac56-\frac{13}{30}=\frac{25}{30}-\frac{13}{30}=\frac{12}{30}=\frac25\)
\(\frac25:\frac{8}{15}=\frac25\cdot\frac{15}{8}=\frac{30}{40}=\frac34\)
\(\frac{20}{27}:\frac59=\frac{20}{27}\cdot\frac95=\frac{20}{5}\cdot\frac{9}{27}=\frac43\)
\(\frac{42}{54}-\frac29=\frac{42}{54}-\frac{18}{54}=\frac{24}{54}=\frac49\)
Kết quả: 1.
Kết quả: 1/2.
Kết quả: 4/7.
Kết quả: 3/4.
Kết quả: 2/5.
Kết quả: 3/4.
Kết quả: 4/3.