Question

Số giá trị nguyên x thỏa mãn

(3x-4)⁵=(3x-4)⁷

Answer 1

<=>(3x-4)^5-(3x-4)^7=0

<=>(3x-4)^5-(3x-4)^5.(3x-4)^2=0

<=>(3x-4)^5.[1-(3x-4)^2]=0

<=>(3x-4)^5=0<=>3x=4<=>x=4/3(loại)

 Hoặc 1-(3x-4)^2=0<=>(3x-4)^2=1<=>3x-4=1 hoặc 3x-4=-1<=>x=1 thoả mãn

 vậy x=1

Answer 2

\(\left(3x-4\right)^7-\left(3x-4\right)^5=0\)

\(\Rightarrow\left(3x-4\right)^2=0\)

\(\Leftrightarrow3x-4=0\)

\(x=\frac{4}{3}\)

Answer 3

ap dung t/c;      1ⁿ  = 0 ta có;

3x-4 = 1

x = 5/3

hoc toan la phai nam chac kien thuc co ban mk gop y vay thoi

Answer 4

xin loi 1ⁿ = 1 hau dau viet voi nhung bai lam thi dung roi hjhj