TL ;

100+100-20+2000-213+384= 2351

ht

\(\text{100+100-20+2000-213+384=}\text{2351}\)

A = 51 − 314 + 213 ; A = 51 − 314 − 213 B = 51 + 213 − 314 ; C = 51 + 314 − 213 ; D = 51 + 213 − 314 ; D = 51 + 213 − 314 E = 51 − 314 − 213 ; E = 51 − 314 + 213 F = 51 − 213 − 314. V ậ y   A = F ;   B = E = D

193 x 100 = 19300

123 + 213 = 336

111 + 889 = 1000

193x100=19300

123+123=246

111+889=1000

`48/10 = 24/5=4,8`

`213/10=213:10=21,3`

`3/1000=3:1000=0,003`

`25/1000 = 25:1000=0,025`

`647/100=647:100=6,47`

`982/100=982:100=9,82`

`385/10000=385:10000=0,0385`

`982/1000=0,982`

a, \(\dfrac{48}{10}\)=4,8   ;   b, \(\dfrac{213}{10}\)=2,13  ;  c, \(\dfrac{3}{1000}\)=0,003  ;  d,\(\dfrac{25}{1000}\)=0,025  ;        e,\(\dfrac{647}{100}\)=6,47;   f,\(\dfrac{982}{100}\)=9,82    ;     g,\(\dfrac{385}{10000}\)=0,0385 ;h,\(\dfrac{982}{1000}\)=0,0982                                                                           

9,6x213+213:5+213x0,1+213:10

= 9,6 x 213 + 213 x 0,2 + 213 x 0,1 + 213 x 0,1

= 213 x (9,6+0,2+0,1+0,1)

= 213 x 10= 2130

Từ 100 đến 213 có số số chẵn là :

( 212 - 100 ) : 2 + 1 = 57 ( số )

Từ 100 đến 2013 có số số lẻ là :

( 213 - 101 ) : 2 + 1 = 57 ( số )

57 số bạn nhé 

A = \(\dfrac{27}{512}\) \(\times\) \(\dfrac{327}{213}\) \(\times\) \(\dfrac{512}{57}\) \(\times\) \(\dfrac{213}{54}\) \(\times\) \(\dfrac{57}{327}\)

A = \(\dfrac{27\times327\times512\times213\times57}{54\times327\times512\times213\times57}\) 

A = \(\dfrac{27}{54}\)

A = \(\dfrac{1}{2}\)

sửa giùm mình đề câu a

a, 123+132+231+312+213+312

123+132+213+312+213+312

=(123+213)+(312+312)+(123+132)

= 123×2 + 312 ×2 + 255

= 426 + 624 +255

= 1050 + 255

= 1305

2) 159+195+519+591+915+951

=(159+951)+(519+591)+(195+915)

= 1110+1110+1110

= 1110×3

=3330

213 x 3 639