512

3412

2311

1216

câu 1 = 512

câu 2 = 3412

cau 3 = 2311

cau 4 = 1216

Tìm x:

 3145 - 246 + 2347 - 145 + 4246 - 347

= (3145 - 145) + (4246 - 246) + (2347 - 347)

= 3000 + 4000 + 2000

= 7000 + 2000

= 9000

 3145 - 246 + 2347 - 145 + 4246 - 347

= (3145 - 145) + (2347 - 347) + (4246 - 246)

= 3000 + 2000 + 4000

= 5000 + 4000

= 9000

Tk cho mình nha ae!!!!!!!!!!!!!!! Ai tk mình thì mình tk lại.

a)

349 + 602 + 651 + 398

= (349 + 651 ) + (602 + 398)

= 1000 + 1000

= 2000

b) 

3145 - 246 + 2347 - 145 + 4246 - 347

= (3145 - 145) + (4246 - 246) + (2347 - 347)

= 3000 + 4000 + 2000

= 7000 + 2000

= 9000

\(349+602+651+398\)

\(=\left(349+651\right)+\left(602+398\right)\)

\(=1000+1000\)

\(=2000\)

_____

\(3145-246+2347-145+4246-347\)

\(=\left(3145-145\right)+\left(2347-247\right)+\left(4246-246\right)\)

\(=3000+2000+4000\)

\(=9000\)

25 m x 2 = 50 m

15 km x 4 = 60 km

34 cm x 6 = 204 cm

36 hm : 3 = 12 hm

70 km : 7 = 10 km

55 dm : 5 = 11dm

25m x2 =50 m

15km x4 =60 km

34 cm x6= 204cm

96cm :3 =32 cm

36hm :3 =12 hm

70km :7 =10 km

55dm :5 =11 dm

a) x -2143=1341

x              = 1341 + 2143

x               = 3484

b) x-2146=4146

x             = 4146+2146

x             =6292

c) x+528 = 1322 + 249

x     + 528=1571

x              =1571-528

x             =1043

d) x -3145=3915

x             =3915+3145

x                =7060

8 hm = 800 m

8 m = 80 dm

9 hm = 900 m

6 m = 600 cm

7 dam = 70 m

8 cm = 800 mm

3 dam = 30 m

4 dm = 400 mm.

8 hm = 800 m

8 m = 80 dm

9 hm = 900 m

6 m = 600 cm

7 dam = 70m

8 cm = 800mm

3 dam = 30 m

4 dm = 400 mm

25dam x 2 = 50dam         48m : 4 = 12m

      18hm x 4 = 72hm             84dm : 2 = 42dm

      82km x 5 = 410km           66mm : 6 = 11mm

x-100=476-476

x-100=0

x=100

vậy x= 100

x - 100 = 476 - 476

x - 100 = 0

x = 0 + 100

x = 100

k mk nha các bạn

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