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\(\text{2^5.3 - 3.(x+1)=42}\)
\(3\left(x+1\right)=54\)
\(x+1=18\)
\(x=17\)
\(\text{(4x + 5) : 3 - 11^2:11=2^2}\)
\((4x+5):3-11=4\)
\((4x+5):3=15\)
\((4x+5)=5\)
\(4x=0\)
\(x=0\)
\(\text{3x - 15 . 4 = 6.(19 - x)}\)
\(\text{3x - 60 = 6.(19 - x)}\)
\(\text{3x - 60 :(19-x)= 6}\)
\(\Rightarrow x=6\)
\(\text{(x - 7).(2x - 16)=0}\)
\(\Rightarrow\hept{\begin{cases}x-7=0\\2x-16=0\end{cases}\Rightarrow\hept{\begin{cases}x=7\\8\end{cases}}}\)
a) x – 32 : 16 = 48 ó x – 2 = 48 ó x = 48 + 2 ó x = 50
b) 88 – 3.(7+x) = 64 ó 3.(7+x) = 88 – 64 ó 7 + x = 24:3 ó x = 8 – 7 ó x = 1
c) (5+4x) : 3 – 121 : 11 = 4 ó (5+4x) : 3 – 11 = 4 ó (5+4x) : 3 = 4 + 11 ó 5+4x = 15.3 ó 4x = 45 – 5 ó 4x = 40 ó x = 10
d) 15 – 2(3x+1) = 11.13 – 130 ó 15 – 2(3x+1) = 143 – 130 ó 15 – 2(3x+1) = 13
ó 2(3x+1) = 15 – 13 ó 3x + 1 = 2:2 ó 3x = 1 – 1 ó 3x = 0 ó x = 0
a)
<=> 66 - 11x = 4x + 11
<=> -11x - 4x = 11 - 66
<=> -15x = -55
<=> x = -55 : (-15)
<=> x = 11/3
b)
x = 15 . 8 : 6 = 20
\(11\left(x-6\right)=4x+11\)
\(\Rightarrow11x-66=4x+11\)
\(\Rightarrow11x-4x=66+11\)
\(\Rightarrow7x=77\)
\(\Rightarrow x=11\)
Vậy x = 11
\(\left(3x+0,8\right)\div x+14,5=15\)
\(\Rightarrow\left(3x+0,8\right)\div x=15-14,5\)
\(\Rightarrow\left(3x+0,8\right)\div x=0,5\)
\(\Rightarrow3x+0,8=0,5x\)
\(\Rightarrow-2,5x=0,8\)
\(\Rightarrow x=0,8\div\left(-2,5\right)=\frac{-8}{25}\)
Vậy x = \(\frac{-8}{25}\)
thanks