a,\(\left[ \begin{array}{l}2x-5=x-1 (x≥5/2)\\2x-5=-x+1 (x<5/2)\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=4 (t/m)\\x=2(t/m)\end{array} \right.\)
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d, \(\left[ \begin{array}{l}x-2=2x-1 (x≥2)\\x-2=-2x+1(x<2)\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=-1(loại)\\x=1(t/m)\end{array} \right.\)
g, \(\left[ \begin{array}{l}4x+7=2x+5(x≥-7/4)\\4x+7=-2x-5(x<-7/4)\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=-1(t/m)\\x=-2(t/m)\end{array} \right.\)
j, \(\left[ \begin{array}{l}2(x-1)=x+2(x≥1)\\2(x-1)=-x-2(x<1)\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=4(t/m)\\x=0(t/m)\end{array} \right.\)
Cho mình xin ctln nhé !!! Cảm ơn ạ !!!