a)12.(x-5)+7(3-x)=5
\(\Rightarrow12x-60+21-7x-5=0\)
\(\Rightarrow5x-44\)
\(\Rightarrow x=\frac{44}{5}\)
Vậy: \(x=\frac{44}{5}\)
b)\(2x^2-3=29\)
\(\Rightarrow2x^2=3+29=32\)
\(\Rightarrow x^2=\frac{32}{2}=16\)
\(\Rightarrow x=\sqrt{16}=4\)
Vậy: \(x=4\)
Chúc bạn học tốt!!!
a) 12.(x-5)+7(3-x)=5
12x -60+21-7x =5
5x - 39 =5
5x = 44
x = 44/5
b)2.x2-3 =29
2x2 = 32
x2 = 16
x2 = 42
x =4