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0, 9 x 95 + 1, 8 x 2 + 0, 9
= 0,9 x 95 + 0,9 x 2 x 2 + 0,9
= 0,9 x 95 + 0,9 x 4 + 0,9
= 0,94 x ( 95 + 4 + 1 )
= 0,94 x 100
= 94
Nhớ k cho mk nha ^_^
=0.9 x 95 +0.9 x 2 x 2 + 0.9 x 1
=0.9 x (95+4+1)
=0.9 x 100
=90
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4/3 - 1/3 . (X - 1 ) = 1
1.(X -1) = 1
X -1 = 1:1
X - 1 = 1
X = 1 + 1
X = 2
\(\frac{4}{3}-\frac{1}{3}\left(x-1\right)=1\)
\(\frac{1}{3}\left(x-1\right)=\frac{4}{3}-1\)
\(\frac{1}{3}\left(x-1\right)=\frac{1}{3}\)
\(x-1=1\)
\(x=2\)
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=>3x-13=0 hoặc x-9=0
=>3x=13 hoặc x=9
=>x=13/3 hoặc x=9
Vậy x E {13/3;9}
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x(3-x)=0
Th1: x=0
Th2: 3-x=0 => x=3
Vậy x=0 và x=3
(x+2)(4x-8)=0
Th1: x+2= 0 => x=-2
Th2: 4x-8 =0 => 4x =8
x= 2
Vậy x= +- 2 (cộng trừ 2 nhé)
(x+1)+(x+2)+(x+3)+....+(x+199)=5750
199x +(1+2+3+...199) =5750
199x+ {(199+1)* [(199-1)+1] : 2} =5750
199x + 19900= 5750
199x = -14150
x= -14150/199
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\(x+\dfrac{3}{4}=\dfrac{1}{2}+\dfrac{9}{8}\\ x+\dfrac{3}{4}=\dfrac{4}{8}+\dfrac{9}{8}\\ x+\dfrac{3}{4}=\dfrac{13}{8}\\ x=\dfrac{13}{8}-\dfrac{3}{4}\\ x=\dfrac{13}{8}-\dfrac{6}{8}\\ x=\dfrac{7}{8}\)
x + 3/4 = 1/2 + 9/8
x + 3/4 = 13/8
x = 13/8 -3/4
x = 7/8
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\(\left(x-3\right)\left(3x-9\right)=0\)
\(\Rightarrow\hept{\begin{cases}x-3=0\\3x-9=0\end{cases}}\Rightarrow\hept{\begin{cases}x=3\\x=3\end{cases}}\)
Vậy x = 3
x(x-3).(3x-9)=0
x(x-3).3(x-3)=0
(x-3)(x-3)=0
(x-3)^2=0
x-3=0
x=3