Question

1. Tìm x:

a) /x/ + 2 = 2³ . (-2)²

b) /x/ + 4 = (-3)² + (-2)

2. Tính:

a) 5 . ( -5 - 6 )

b) 321 + { -15 + [ 30 + ( -321 )]}

c) 19 . 92 - 9 . ( -19 ) - 19

 

Answer 1

a)   \(\left|x\right|+2=2^3.\left(-2\right)^2\)

\(\Leftrightarrow\)\(\left|x\right|+2=32\)

\(\Leftrightarrow\)\(\left|x\right|=30\)

\(\Leftrightarrow\)\(x=\pm30\)

Vậy...

b) \(\left|x\right|+4=\left(-3\right)^2+\left(-2\right)\)

\(\Leftrightarrow\)\(\left|x\right|+4=7\)

\(\Leftrightarrow\)\(\left|x\right|=3\)

\(\Leftrightarrow\)\(x=\pm10\)

Vậy...

Answer 2

b2 :

a) 5 . ( -5 - 6 )

= 5 . ( -11 )

= -55

b) 321 + { - 15 + [ 30 + ( -321 ) ] }

= 321 + { - 15 + [ - 291 ] }

= 321 + ( - 306 )

= 15

19 . 92 - 9 . ( - 19 ) - 19

= 1748 - ( -171 ) - 19

= 1919 - 19

= 1900