\(=2345-1000:\left[19-2\cdot9\right]=1345\)

\(2345 − 1000 : [ 19 − 2 × ( 21 − 18 )^2]\)

\(= 2345 − 1000 : ( 19 − 2 × 3^2)\)

\(= 2345 − 1000 : ( 19 − 2 × 9 )\)

\(= 2345 − 1000 : ( 19 − 18 )\)

\(= 2345 − 1000 : 1\)

\(= 2345 − 1000\)

\(= 1345\)

2345-1000:[19-2(21-18)²]

= 2345 - 1000 : [19-2x3² ]

=2345-1000 : [19 - 2x9]

= 2345 - 1000 : [19 - 18]

= 2345 - 1000 : 1

= 2345 -1000

= 1345

\(2345-1000\div\text{ }\left[19-2\left(21-18\right)^2\right]\)

\(=2345-1000\div\left(19-2.3^2\right)\)

\(=2345-1000\div\left(19-2.9\right)\)

\(=2345-1000\div\left(19-18\right)\)

\(=2345-1000\div1\)

\(=2345-1000\)

\(=1345\)

mình nhầm!!!

B.1000

C.1345

D.101,8

c nha k mk nha bn kb lun de

2345-1000:(19-2.(21-18)^2)

= 2345 - 1000 : (19 - 2.3²)

= 2345 - 1000 : (19 - 2.9)

= 2345 - 1000 : 1

= 2345 - 1000

= 1345

HỌC TỐT

2345-1000:(19-2.(21-18)^2)

= 2345-1000:(19-2.9)

= 2345-1000:(19-18)

= 2345-1000:1

= 2345-1000

=1345

\(a.3.52+15.22-26:2\\ 156+330-13\\ =486-13\\ =473\)

\(b.53.2-100:4+23.5\\ =106-25+115\\ =81+115\\ =196\)

\(2345-1000:\left[19-2\times\left(21-18\right)^2\right]\)

\(=2345-1000:\left[19-2\times3^2\right]\)

\(=2345-1000:\left[19-18\right]\)

\(=2345-1000\)

\(=1345\)

2345-1000:[19-2(21-18)²]

= 2345-1000:(19-2.3²)

= 2345-1000:(19-2.9)

= 2345-1000:(19-18)

= 2345-1000:1

= 2345 - 1000

= 1345

a)  2345 − 1000 : [19-2(21-18) 2 ]=2345-1000:1=1345

b)  205 − [ 1200 − ( 4 2 − 2.3 ) 3 ]=205-( 1200 − 1000 ) = 5

Ta có :\(2345-1000:\left[19-2\left(21-18\right)^2\right]\)

\(=2345-1000:\left(19-2.3^2\right)\)

\(=2345-1000:\left(19-18\right)=2345-1000:1\)

\(=2345-1000=1345\)

2345 - 1000 : [ 19 - 2 . [ 21 - 12 ) ] 

= 2345 - 1000 : [ 19 - 2 . 9 ]

= 2345 - 1000 : [ 19 - 18 ] 

= 2345 - 1000 : 1 

= 2345 - 1000

= 1345