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Điền số thích hợp vào chỗ chấm
2 dm2 30 cm2 = 230 cm2
1957 cm2 = 19 dm2 57 cm2
7700 cm2 = 77 dm2
986 dm2 = 98 600 cm2
2110 m2 = 211 000 dm2
100 dm2 = 1 m2
2 dm2 30 cm2 = 230 cm2
1957 cm2 = 19dm2 57 cm2
7700 cm2 = 77 dm2
986 dm2 = 98600 cm2
2110 m2 = 211000 dm2
100 dm2 = 1 m2
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a) 4 m2 = 40000 cm2 m2 = 50dm2
16 m2 = 1600 dm2 dm2 = 50 cm2
308 dm2 = 30800cm2 m2 = 100 cm2
b) 700 cm2 = 7 dm2 15 m2 9 dm2 = 1509 dm2
3400 dm2 = 34 m2 7 dm2 25 cm2 = 725 cm2
50 000 cm2 = 5 m2 28 m2 50 cm2 = 280050 cm2
c) 948 dm2 = 9 m2 48 dm2 8791 dm2 = 87 m2 91 dm2
705 cm2 = 7 dm2 5cm2 30 045 cm2 = 3 m2 45 cm2
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508 dm2 = 50800 cm2 ; 2007 cm2 = 20 dm2 7 cm2 ; 3100 cm2 = 31 dm2 ; 6 dm2 = 600 cm2
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a) 1 dm2 = 100 cm2
14 dm2 = 1 400 cm2
1 m2 = 100 dm2
b) 300 cm2 = 3 dm2
5 000 cm2 = 50 dm2
300 dm2 = 3 m2
c) 7 dm2 60 cm2 = 760 cm2
29 dm2 8 cm2 = 2 908 cm2
d) 125 cm2 = 1 dm2 25 cm2
6870 cm2 = 68 dm2 70 cm2
a) 1 dm2 = 100 cm2
14 dm2 = 1 400 cm2
1 m2 = 100 dm2
b) 300 cm2 = 3 dm2
5 000 cm2 = 50 dm2
300 dm2 = 3 m2
c) 7 dm2 60 cm2 = 760 cm2
29 dm2 8 cm2 = 2 908 cm2
d) 125 cm2 = 1 dm2 25 cm2
6870 cm2 = 68 dm2 70 cm2
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210 c m 2 = 2 d m 2 10 c m 2
1954 c m 2 > 19 d m 2 50 c m 2
6 d m 2 3 c m 2 = 603 c m 2
2001 c m 2 < 20 d m 2 10 c m 2
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4357 cm2 = 43 dm2 57 cm2
15 dm2= 150 000 mm2
20185 cm2 = 2 m2 1 dm2 85 cm2
418 dm2 = 41 800 cm2
32865 mm2 = 3 dm2 28 cm2 65 mm2
216 m2 = 21 600 dm2 = 2 160 000 cm2
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Bài 3 :
\(5\) tấn \(6\) tạ \(=5600kg\) ; \(8tạ=800kg\)
Xe thứ nhất chở : \(\left(5600-800\right):2=2400\left(kg\right)\)
Xe thứ hai chở : \(5600-2400=3200\left(kg\right)\)
Bài 4 :
a) \(840\times45-25\times840+80\times840\)
\(=840\times\left(45-35+80\right)\)
\(=840\times100\)
\(=84000\)
b) \(27\times8+9\times4\times3-2\times27\)
\(=27\times8+9\times3\times4-2\times27\)
\(=27\times8+27\times4-2\times27\)
\(=27\times\left(8+4-2\right)\)
\(=27\times10\)
\(=270\)
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\(254dm^2=2m^254dm^2\)
\(40059cm^2=4m^259cm^2\)
\(750dm^2=7m^250dm^2\)
\(3020cm^2=30dm^220cm^2\)
1396 dm2 = 139600 cm2
1396dm2=139600cm2