\(\left|\frac{-12}{17}\right|.\left(\frac{-34}{9}\right)\)

= \(\frac{12}{17}.\left(\frac{-34}{9}\right)\)

= \(\frac{4.\left(-2\right)}{1.3}\)

= \(\frac{-8}{3}\)

phần b thi đáp án là180 km

a) A(x)= -2x\(^6\)+ 5x\(^5\)+ x\(^4\)+ ( 2x + x )

          = -2x\(^6\) + 5x\(^5\)+ x\(^4\)+ 3x

Bậc : 6

b) C(x)= A(x) + B(x)

A(x) + B(x) = -2x\(^6\)+ 5x\(^5\)+ x\(^4\)+3x + 6x\(^6\)- 5 x\(^5\)+2x\(^4\)+ 2x + 1

                 = (-2x\(^6\)+ 6x\(^6\))+(5x\(^5\)- 5x\(^5\))+(x\(^4\)+2x\(^4\))+(3x+2x)+1

                 =4x\(^6\)+3x\(^4\)+5x+1

Bậc :6

c) Đa thức C(x) không có nghiệm( vô nghiệm )

1312 : ( 3x - 19 ) = 32

\(\Rightarrow3x-19=1312:32\)

\(\Rightarrow3x-19=41\)

\(\Rightarrow3x=41+19\)

\(\Rightarrow3x=60\)

\(\Rightarrow x=60:3\)

\(\Rightarrow x=20\)

Vậy x=20

\(\left|\frac{-12}{7}\right|.\frac{-34}{9}\)

= \(\frac{12}{7}.\frac{-34}{9}\)

= \(\frac{4.\left(-2\right)}{1.1}\)

= \(-8\)