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Bài 9:
\(\Leftrightarrow\dfrac{x}{5}=\dfrac{y}{-3}=\dfrac{z}{-17}=\dfrac{t}{9}=-2\)
=>x=-10; y=6; z=34; t=-18
Bài 10:
\(\Leftrightarrow\dfrac{8}{x}=\dfrac{y}{21}=\dfrac{40}{z}=\dfrac{16}{t}=\dfrac{u}{111}=\dfrac{4}{3}\)
=>x=6; y=28; z=30; t=12; u=148
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g: =>2x+1/2=0 hoặc 2x-3=0
=>x=-1/4 hoặc x=3/2
h: =>4x-5=0 hoặc 5/4x-2=0
=>x=5/4 hoặc x=2:5/4=2*4/5=8/5
i: =>(2x+1/2)^2=1/9
=>2x+1/2=1/3 hoặc 2x+1/2=-1/3
=>2x=-1/6 hoặc 2x=-5/6
=>x=-5/12; x=-1/12
k: =>(3x-1/2)^2=4/9
=>3x-1/2=2/3 hoặc 3x-1/2=-2/3
=>3x=7/6 hoặc 3x=-1/6
=>x=7/18; x=-1/18
i: =>7/6x=-10/3+1=-7/3
=>x=-2
m: =>x+1=4
=>x=3
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a: -7/15=-28/60
5/12=25/60
b: 1/5=6/30
-2/3=-20/30
7/10=21/30
\(-\dfrac{7}{15}=\dfrac{-7.4}{15.4}=\dfrac{-28}{60};\dfrac{5}{12}=\dfrac{5.5}{12.5}=\dfrac{25}{60}\)
\(\dfrac{1}{5}=\dfrac{1.6}{5.6}=\dfrac{6}{30};\dfrac{-2}{3}=\dfrac{-2.10}{3.10}=\dfrac{-20}{30};\dfrac{7}{10}=\dfrac{7.3}{10.3}=\dfrac{21}{30}\)
chọn C
C