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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.
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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
\(349+602+651+398\)
\(=\left(349+651\right)+\left(602+398\right)\)
\(=1000+1000\)
\(=2000\)
_____
\(3145-246+2347-145+4246-347\)
\(=\left(3145-145\right)+\left(2347-247\right)+\left(4246-246\right)\)
\(=3000+2000+4000\)
\(=9000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
25dam x 2 = 50dam 48m : 4 = 12m
18hm x 4 = 72hm 84dm : 2 = 42dm
82km x 5 = 410km 66mm : 6 = 11mm
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 100 = 476 - 476
x - 100 = 0
x = 0 + 100
x = 100
k mk nha các bạn
Mình cảm ơn các bạn nhiều
Thank you very much
2168hm + 875hm :5 =2343 hm
4728-476x6=1872
2367dam x 3 -4864 dam =2237 dam
{3145 - 1967 } x 4=4712
vote chi nha