a, 332            

b, 421

a)-17/23=-171717/232323

b)-265/317<-83/111

c)2002/2003<14/13

d)-27/463<1/3

x=153

y=54

a) \(\left(x+1\right)\left(x+2\right)=272\)

\(\Rightarrow x^2+3x+2=272\)

\(\Rightarrow x^2+3x-270=0\)

\(\Rightarrow x^2+18x-15x-270=0\)

\(\Rightarrow x\left(x+18\right)-15\left(x+18\right)=0\)

\(\Rightarrow\left(x+18\right)\left(x-15\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x+18=0\\x-15=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-18\\x=15\end{matrix}\right.\)

d) \(\left(x+4\right)\left(x+5\right)=552\)

\(\Rightarrow x^2+9x+20=552\)

\(\Rightarrow x^2+9x-532=0\)

\(\Rightarrow x^2+28x-19x-532=0\)

\(\Rightarrow x\left(x+28\right)-19\left(x+28\right)=0\)

\(\Rightarrow\left(x+28\right)\left(x-19\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x+28=0\\x-19=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-28\\x=19\end{matrix}\right.\)

2 bạn sai rồi!!!

2087 - x :27 = 2015

x : 27 = 2087 - 2015

x : 27 = 72

x = 72 x 27

x = 1944

2087 - x : 27 = 2015

          x : 27 = 2087 - 2015

          x : 27 = 72

          x       =72 x 27

         x        =1944

 45 x ( 463 + x ) = 44955

          463 + x  = 44955 : 45

          463 + x = 999

                   x  = 999 - 463

                   x  = 536

2087-x:27=2015

        x:27=2087-2015

        x:27=72

        x    =72x27

        x    =1944

45x(463+x)=44955

       463+x=44955:45

       463+x=999

              x=999-463

              x=536

a)x=0

b)x=-2

a: =>4(x-3)=49-1=48

=>x-3=12

=>x=15

b: =>123-5(x+4)=38

=>5(x+4)=123-38=85

=>x+4=17

=>x=13

c: =>2x-138=9*8=72

=>2x=72+138=210

=>x=105

Đáp án là : 

1. 2 và 461 . 

2. x = -11;-9;-8;-6;-5;-3 . 

giải chi tiết chứ ko phải có nguyên đáp án

dù sao cũng cảm ơn bạn