\(\left|-2005\right|\) + ( - 680 ) + 738 + ( 320 )

= 2005 + ( - 680 ) + 738 + 320

= ( \(\left|2005\right|\) - \(\left|-680\right|\) ) +( 738 +320 )

= ( 2005 - 680 ) + 1058

= 1325 + 1058

= 2383

a, 45 320 +  x  =  68 415

x = 68 415 – 45 320

x = 23095

b, x – 6 738  =  2 426

x = 2426 + 6738

x = 9164

em nhóm (445+555) + (800+200)+(680+320)
                =   1000     +    1000      +    1000
                = 3000 nha em;chúc em hok tốt nha

Ta có : 

120 = 2³.3.5

320 = 2⁶.5

ƯCLN(120,320)=2³.5 = 4

Ta có :

168 = 2³.3.7

120 = 2³.3.5

144 = 2⁴.3²

ƯCLN(168,120,144)= 2³.3 = 24

Ta có : 

612 = 2².3².17

680 = 2³.5.17

ƯLCN(612,680)= 2².17 = 68

anh oi mac du e k dung 

nhung ma anh lam sai o phep dau y cai ket qua do

a) 3 kg + 30 kg + 270 kg = 3 kg + (30 kg + 270 kg)

                                         = 3 kg + 300 kg

                                         = 303 kg

b) 320 km + 32 km + 680 km + 68 km

= (320 km + 680 km) + (32 km + 68 km)

= 1 000 km + 100 km

= 1 100 km

c) 2 500 $\ell $ + 2 900 $\ell $ + 2 100 $\ell $ + 2 500 $\ell $

= (2 500 $\ell $ + 2 500 $\ell $) + (2 900 $\ell $ + 2 100 $\ell $)

= 5 000 $\ell $ + 5 000 $\ell $

= 10 000 $\ell $

a, 256

b, 2010

Nếu đúng thì k cho mình nha

a) (26x320+13x640):65=(8320+13x640):65

                                 = (8320+8320):65

                                 =16640:65

                                 =256

Tham khảo

309

\(\text{738-429}=309\)