\(\Rightarrow2x=9,18-4,72\)

\(\Rightarrow2x=4,46\)

\(\Rightarrow x=2,23\)

\(f\left(1\right)=2+m\)

Đa thức có nghiệm khi

\(2+m=0\)

\(\Rightarrow m=-2\)

Vậy đa thức có nghiệm \(m=-2\)

you là Trần Thùy Dung phải ko

\(5A=5^2+5^3+....+5^{102}\)

\(\Rightarrow5A-A=4A=\left(5^2+5^3+....+5^{102}\right)-\left(5+5^2+.....+5^{102}\right)\)

\(\Rightarrow4A=5^{102}-5\)

\(\Rightarrow A=\frac{5^{102}-5}{4}\)

a)

\(\left(2x-3\right)^2=36\)

\(\Rightarrow\left[\begin{array}{nghiempt}\left(2x-3\right)^2=6^2\\\left(2x-3\right)^2=\left(-6\right)^2\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}2x-3=6\\2x-3=-6\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{9}{2}\\x=-\frac{3}{2}\end{array}\right.\)

b)

\(\left(x+2\right)^4=16\)

\(\Rightarrow\left[\begin{array}{nghiempt}\left(x+2\right)^4=2^4\\\left(x+2\right)^4=\left(-2\right)^4\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x+2=2\\x+2=-2\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=0\\x=-2\end{array}\right.\)

c)

\(\left(3x+2\right)^3=81\)

\(\Rightarrow\left(3x+2\right)^3=3^3\)

\(\Rightarrow3x+2=3\)

\(\Rightarrow x=\frac{1}{3}\)

\(A=5+5^2+....+5^{101}\)

\(\Rightarrow5A=5^2+5^3+....+5^{102}\)

\(\Rightarrow5A-A=4A=\left(5^2+5^3+....+5^{102}\right)-\left(5+5^2+....+5^{101}\right)\)

\(\Rightarrow4A=5^{102}-5\)

\(\Rightarrow A=\frac{5^{102}-5}{4}\)

1. a toothache         b. sore throat               c. cough                      d. head

2a school                b. cinema                      c. place                    d. circus

3 a. tomorrow           b. next week             c yesterday            d. next month

4.a.played                b. drew                     c. thought                d. bought

5.a. short                b. slim                             c. well                  d.thin

Không liên quan gì hết vậy bạn

a)

\(\Rightarrow3^x\left(3^2+3+1\right)=117\)

\(\Rightarrow3^x.13=117\)

\(\Rightarrow3^x=9\)

\(\Rightarrow3^x=3^2\)

=>x=2

b)

\(3^{2x+1}=3^{-4}\)

=> 2x+1= - 4

=>\(x=-\frac{5}{2}\)

c)

\(\left(x+2\right)^4=16\)

\(\Rightarrow\left[\begin{array}{nghiempt}\left(x+2\right)^4=2^4\\\left(x+2\right)^4=\left(-2\right)^4\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x+2=2\\x+2=-2\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=0\\-4\end{array}\right.\)