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\(74\left(x-3\right)=0\)
\(\Rightarrow x-3=0\)
\(\Rightarrow x=3\)
a) \(6x-5=613\)
\(\Leftrightarrow6x=618\)
\(\Leftrightarrow x=103\)
b) \(74\left(x-3\right)=0\)
\(\Leftrightarrow x-3=0\Leftrightarrow x=3\)
\(a,\Rightarrow6x=613+5=618\\ \Rightarrow x=103\\ b,\Rightarrow x-3=0\Rightarrow x=3\)
a) \(3\left(x-5\right)+6=36\)
\(\Rightarrow3\cdot\left(x-5\right)=36-6\)
\(\Rightarrow3\cdot\left(x-5\right)=30\)
\(\Rightarrow x-5=10\)
\(\Rightarrow x=10+5\)
\(\Rightarrow x=15\)
b) \(200-8\cdot\left(x+7\right)=24\)
\(\Rightarrow8\cdot\left(x+7\right)=200-24\)
\(\Rightarrow8\cdot\left(x+7\right)=176\)
\(\Rightarrow x+7=\dfrac{176}{8}\)
\(\Rightarrow x+7=22\)
\(\Rightarrow x=22-7\)
\(\Rightarrow x=15\)
c) \(\left(x-890\right)\left(74-x\right)=0\)
+) \(x-890=0\)
\(\Rightarrow x=890\)
+) \(74-x=0\)
\(\Rightarrow x=74\)
d) \(\left(31-x\right)\cdot\left(x-64\right)=0\)
+) \(31-x=0\)
\(\Rightarrow x=31\)
+) \(x-64=0\)
\(\Rightarrow x=64\)
1) \(\Rightarrow5x-36=216\)
\(\Rightarrow5x=252\Rightarrow x=\dfrac{252}{5}\)
2) \(\Rightarrow\left[{}\begin{matrix}x-890=0\\74-x=0\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=890\\x=74\end{matrix}\right.\)
(5x-36):18=12
5x-36=216
5x=252
x=50,4
(x-890)(74-x)=0
=> x-890=0 hoặc 74-x=0
x=890 hoặc x=74
\(66:\left(2x-3\right)-22=0\Leftrightarrow66:\left(2x-3\right)=0+22\)
\(\Leftrightarrow66:\left(2x-3\right)=22\Leftrightarrow2x-3=66:22\Leftrightarrow2x-3=3\)
\(\Leftrightarrow2x=3+3\Leftrightarrow2x=6\Rightarrow x=6:2\Leftrightarrow x=3\)
\(74.\left(x-2\right)-2^3.3=2.5^2\Leftrightarrow74.\left(x-2\right)-8.3=2.25\)
\(\Leftrightarrow74.\left(x-2\right)-8.3=50\Leftrightarrow74.\left(x-2\right)-24=50\)
\(\Leftrightarrow74.\left(x-2\right)=50+24\Leftrightarrow74.\left(x-2\right)=74\)
\(\Leftrightarrow x-2=74:74\Leftrightarrow x-2=1\Leftrightarrow x=1+2\Leftrightarrow x=3\)
66 : ( 2x - 3 ) -22 =0
66 : ( 2x - 3 ) = 22
2x-3=66:22
2x-3=11
2x=11+3
2x=14
x=14:2
x=2
a. 3.5x-100=74
3.5x = 74 + 100 = 74 + 1 = 75
5x = 75 : 3 = 25 = 52
\(\Rightarrow\)x = 2
b. 232-(3x+2)5=23.52
( 3x + 2 )5 = 232 - 200 = 32 = 25
\(\Rightarrow\)3x + 2 = 2
3x = 0
\(\Rightarrow\)x = 0
\(a.3.5^x-10^0=74\)
\(\Rightarrow3.5^x=75\)
\(\Rightarrow5^x=25\)
\(\Rightarrow x=2\)
Câu còn lại tương tự
\(74\left(x-3\right)=0\)
\(\Leftrightarrow x-3=0\)
\(\Leftrightarrow x=3\)
VẬY x=3