A= x= 3;4

B x=1;2

\(a,\left(x-3\right)^{27}=\left(x-3\right)^{127}\)

\(\Leftrightarrow\left(x-3\right)^{127}-\left(x-3\right)^{27}=0\)

\(\Leftrightarrow\left(x-3\right)^{27}\left[\left(x-3\right)^{100}-1\right]=0\)

\(\Rightarrow\orbr{\begin{cases}\left(x-3\right)^{27}=0\\\left(x-3\right)^{100}-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x-3=0\\\left(x-3\right)^{100}=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=3\\x-3=\pm1\end{cases}\Rightarrow}x\in\left\{2;3;4\right\}}\)

Vậy \(x\in\left\{2;3;4\right\}\)

\(b,\left(x-1\right)\left(x-2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-1=0\\x-2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=2\end{cases}}\)

Vậy \(x\in\left\{1;2\right\}\)

suy ra 0^27=0^127 hoặc 1^27 =1^127

nếu x-3=0 thi x =3

x-3=1thì x=4

Vậy x=3;4

(-127) x 73+(-127) x 27

=(-127) . (73+27)

=(-127).100

=-12700

27 . (-17) + 17 . 127

= (-27) . 17 + 17 . 127

= 17 . (-27 + 127)

= 17 . 100

= 1700

Chúc bạn học tốt (*^▽^*)

27 x (-17) + (17) x 127

= (-27) . 17 + 17 . 127

= 17. [(-27) + 127]

= 17 . 100

= 1700

# HOK TỐT #

27 x (-17)+(17) x 127

=-17 x (27+127)

=-17 x 154

=-2618

( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)

= ( 1+3+5+7+…+2003+2005) x (125 x 1001 x 127 – 127 x 1001x 125)

=  ( 1+3+5+7+…+2003+2005) x                   0  =    0

a) (−27). 1011 − 27. (−12) + 27. (−1)

= (-27). (1011 - 12 + 1)

= (-27). 1000 = -27 000

b) (−9). (−9). (−9) + 103 + 9.3

= (-9). 3 + 103 + 9.3

= 9.3 - 9.3 + 103

= 0 + 103 = 103

c) (−157). (127 − 316) − 127. (316 − 157)

= (-157). 127 - 316. (-157) - 127.316 - 127. (-157)

= (-157). 127 + 316. 157 - 127. 316 + 127.157

= (127.157 - 157.127) + (316. 157 - 127.316)

= 0 + (157 - 127). 316

= 0 + 30. 316

= 9480

12,56 x 127 - 12,56 x 27 + 0,8744 : 100

= 12,56 x ( 127 - 27 ) + 0,008744

= 12,56 x 100 + 0,008744

= 1256 + 0,008744

= 1256,008744

1256,008744 nha bạn

1256.005744