a) \(\left(-23\right)+230+23=0+230=230.\)

b) \(124.\left(-54\right)+24.54=54.\left(-124+24\right)=54.\left(-100\right)=-5400.\)

c) \(-927+1421+930+\left(-1421\right).\)

\(=-927+930=3.\)

a) (-23) + 230 + 23 =230

b) 124 . (-54) + 24 . 54 =− 5400.

c) -927 + 1421 + 930 + (-1421) =3.

d) (-351) + (-74) + 51 + (-126) + 149=-351

a) [ 316 – ( 25 . 4 + 16 )] : 8 – 24

=( 316 – 116 ) : 8 – 24 = 200 ∶ 8 – 24 = 25 – 24 = 1

b) | -15| + (-27) + 8 + | - 23|

= 15 – 27 + 8 + 23 = 19

c)  5 8   :   5 6   +   2 2   .   3 3   -   2010 0  =  5 2 + 4 . 27 – 1 = 25 + 108 – 1 = 132

\(a.17+26:2\\ =17+13\\ =30\\ b.300:\left[130-6\left(45-40\right)\right]\\ =300:\left[130-6.5\right]\\ =300:\left[130-30\right]\\ =300:100\\ =3\\ c.\left(-15\right).\left(-2\right)\\ =15.2\\ =30\\ d.\left(-27\right).36+54.\left(-27\right)\\ =\left(-27\right)\left(36+54\right)\\ =\left(-27\right).90\\ =-2430\)

a) 17+14=31

b) 300:[130-6.5)

300:[130-30]

300:100

3

c)30

d)(36+54).(-27)

=90.(-27)

=-2430

\(-21.27+21.50+\left(-21\right).\left(-127\right)=21.\left(-27+50+127\right)=21.150=3150\)

-27+l-127l-100

=-27+127-100

=[127+(-27)]-100

=100-100

=0

Tao còn ngu tao ko biết

a)  2 3 − 2 7 = 2 × 7 3 × 7 − 2 × 3 7 × 3 = 14 21 − 6 21 = 14 − 6 21 = 8 21

b)  4 9 : 2 3 = 4 9 × 3 2 = 4 × 3 9 × 2 = 12 18 = 12 : 6 18 : 6 = 2 3

a) 25.69+31.25-25.6

= 25.(69+31-6)

= 25.94

= 2350

b) 198:[130-(27-19)²]+2021⁰

= 198:[130-8²]+1

= 198:(130-64)+1

= 198:66+1

= 3+1

= 4

c) 5²⁰:[5¹⁵.(15+10)]

= 5²⁰:[5¹⁵.25]

= 5²⁰:(5¹⁵.5²⁾

= 5²⁰: 5¹⁷

= 5³

a: \(=\dfrac{-3^4\cdot2^8}{2^2\cdot2^2\cdot3^2}=-3^2\cdot2^2=-6^2=-36\)

b: \(=\dfrac{3^6\cdot2^{15}}{3^6\cdot2^6\cdot2^{15}}=\dfrac{1}{2^6}=\dfrac{1}{64}\)

c: \(=\left(\dfrac{0.8}{0.4}\right)^5\cdot\dfrac{1}{0.4}=2^5\cdot\dfrac{1}{0.4}=\dfrac{32}{0.4}=80\)