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6: =>x=9/10+1/5=9/10+2/10=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: =>x=7/6-5/4=14/12-15/12=-1/12
9: =>x=1/35+2/7=1/35+10/35=11/35
10: =>x=2/7-7/10=20/70-49/70=-29/70
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1: =>x=-5/3-1/2=-13/6
2: =>x=1/3-3/5=-4/15
4: =>x=-7/9+4/3=-7/9+12/9=5/9
5: =>x=5/6-7/3=5/6-14/6=-9/6=-3/2
6: =>x=9/10+1/5=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: Đề sai rồi bạn
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647 - [6. (107 . 8 - 7 . 23) + 5 . 25 : 24 ]
= 647 - [6. (856 - 7 .8) + 5 . 2 ]
= 647 - [6. (856 - 56) + 5 . 2]
= 647 - [6. 800 + 5 . 2]
= 647 - [ 4800 + 10]
= 647 - 4810
= -4163
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\(A=\frac{7}{11}\cdot\frac{-39}{190}\cdot\frac{76}{21}=\frac{-39\cdot7\cdot76}{11\cdot190\cdot21}=\frac{-273}{550}\)
B=\(\left(\frac{5}{8}+\frac{4}{5}\right)\)\(\cdot\left(2-\frac{2}{107}\right)\)
=>B=\(\frac{57}{40}\cdot\frac{212}{107}=\frac{57\cdot212}{40\cdot107}=\frac{3021}{1070}\)
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=107-{38+[7.9-24:6+(9-343]}:15
=107- {38+[7.9-24:6+-334]}:15
=107-{38+-322}:15
=107--284:15
=107--18,93333333
=117,9333333
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n.(2x-5)2=9
(2x-5)2=32
* 2x-5=3 * 2x-5=-3
2x=3+5 2x=-3+5
2x=8 2x=2
x=8:2 x=2:2
x=4 x=1
vậy x=4 hoặc x=1
o.(1-3x )3=-8
(1-3x)3=(-2)3
1-3x=-2
3x=1-(-2)
3x=3
x=3:3
x=1
vậy x=1
5.(2x + 7) = 107
=> 2x + 7 = 21,4
=> 2x = 14,4
x = 7,2