Tìm \(x\) biết:
\(a){{\left( x+5 \right)}^{2}}-2\left( x+5 \right)\left( x-2 \right)+{{\left( x-2 \right)}^{2}}=49\)
\(b)\ 4{{x}^{2}}+12x+9=0\)
\(c)\ 9{{x}^{2}}-16=0\)
\(d)\ {{x}^{3}}-3{{x}^{2}}+3x+63=0\)
A.
B.
C.
D.
\(a){{\left( x+5 \right)}^{2}}-2\left( x+5 \right)\left( x-2 \right)+{{\left( x-2 \right)}^{2}}=49\)
\(b)\ 4{{x}^{2}}+12x+9=0\)
\(c)\ 9{{x}^{2}}-16=0\)
\(d)\ {{x}^{3}}-3{{x}^{2}}+3x+63=0\)
A.
B.
C.
D.
Loga
Hóa Học lớp 12
