Bài 1:
a)
\(15-5x=0\\ \Rightarrow x=\dfrac{15}{5}=3\)
b)
\(\left(3x-5\right)^2-\left(x+1\right)\left(9x-1\right)=4\\ \Rightarrow9x^2-30x+25-9x^2+x-9x+1-4=0\\ \Rightarrow22x+22=0\\ \Rightarrow x=-\dfrac{22}{22}=-1\)
c)
\(\dfrac{2\left(3x+1\right)}{4}-5=\dfrac{3\left(3x-1\right)}{5}-\dfrac{3x+2}{10}\\ \Rightarrow\dfrac{30x+30}{20}-\dfrac{100}{20}=\dfrac{36x-12}{20}-\dfrac{6x+4}{20}\\ \Rightarrow30x+30-100-36x+12+6x+4=0\\ \Rightarrow-54=0\)
=> PT vô nghiệm
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