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a)Bn kẻ bảng nha
b) xy+x+y=9
<=> x(y+1)+y+1=9+1
<=>x(y+1)+(y+1)=10
<=>(y+1)(x+1)=10
bn tự kẻ bảng nha
a) <=>5x-x=57+7
<=> 4x=64
<=> x=16
b) <=>4x=28+12
<=> x=40/4
<=>10
c) th1 x=0
th2 x-3=0
<=>x=3
d) th1 2x-4=0
<=> x=2
th2 x+1=0
<=> x=-1
câu e mình ko biết làm hihi
a, 5x - 7 = x + 57
5x - x = 57 + 7
4x = 64
x = 64 : 4
x = 16
b, x + 3x - 12 = 28
4x = 28 + 12
4x = 40
x = 10
c, x(x-3) = 0
\(\Rightarrow\orbr{\begin{cases}x=0\\x-3=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x=3\end{cases}}}\)
d, (2x-4)(x+1)=0
\(\Rightarrow\orbr{\begin{cases}2x-4=0\\x+1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}}\)
e, 1+2+...+x=120
=> \(\frac{x\left(x+1\right)}{2}=120\)
=> x(x+1) = 120.2
=>x(x+1) = 240
=> x(x+1) = 15.16
=> x=16
\(\left(3x-2\right)^3\cdot4=256\)
\(\left(3x-2\right)^3=256:4\)
\(\left(3x-2\right)^3=64\)
\(\left(3x-2\right)^3=4^3\)
\(\Rightarrow3x-2=4\)
\(3x=4+2\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
a) \(\dfrac{5x-3}{3-2x}=\dfrac{2}{3}\)
\(\Rightarrow3\left(5x-3\right)=2\left(3-2x\right)\)
\(\Rightarrow15x-9=6-4x\)
\(\Rightarrow15x+4x=9+6\)
\(\Rightarrow19x=15\Rightarrow x=\dfrac{15}{19}\)
b) \(\left(\dfrac{4}{5}x+\dfrac{2}{3}\right):\dfrac{3}{4}=2\)
\(\Rightarrow\dfrac{4}{5}x+\dfrac{2}{3}=\dfrac{3}{2}\Rightarrow\dfrac{4}{5}x=\dfrac{5}{6}\)
\(\Rightarrow x=\dfrac{25}{24}\)
c) \(\dfrac{3}{4}x-\dfrac{1}{3}=\dfrac{3}{5}\Rightarrow\dfrac{3}{4}x=\dfrac{14}{15}\)
\(\Rightarrow x=\dfrac{56}{45}\)
d) \(\dfrac{2}{3}-\dfrac{3}{5}:x=\dfrac{1}{4}\Rightarrow\dfrac{3}{5}:x=\dfrac{5}{12}\)
\(\Rightarrow x=\dfrac{36}{25}\)
7x + 135 : 45=52
7x + 3 = 52
7x= 52 - 3
7x= 49
7x= \(7^2\)
\(\Rightarrow\) x=2
a)
\(x\cdot\left(x-4\right)=0\)
\(\orbr{\begin{cases}x=0\\x-4=0\end{cases}}\)
\(\orbr{\begin{cases}x=0\\x=0+4\end{cases}}\)
\(\orbr{\begin{cases}x=0\\x=4\end{cases}}\)
b)
\(375-\left(28+5x\right)=277\)
\(28+5x=375-277\)
\(28+5x=98\)
\(5x=98-28\)
\(5x=70\)
\(x=14\)
c)
\(2x+24=46\)
\(2x=46-24\)
\(2x=22\)
\(x=11\)
a) \(x\left(x-4\right)=0\Leftrightarrow\orbr{\begin{cases}x=0\\x=4\end{cases}}\)
b) \(375-\left(28+5x\right)=277\)
\(\Leftrightarrow5x=70\)
\(\Rightarrow x=14\)
c) \(5x-3x+24=46\)
\(\Leftrightarrow2x=22\)
\(\Rightarrow x=11\)