tính:
720 m + 43 m =
403cm – 52 cm =
27 mm : 3 =
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a) 27 m = 2 700 cm
145 m = 145 000 mm
65 000 mm = 65 m
b) 8m2 = 800 dm2
77cm2 = 7 700 mm2
10 000 cm2 = 1 m2
g: \(=-457+237+23-123=-220-100=-320\)
h: \(=\left(1-3\right)+\left(5-7\right)+...+\left(41-43\right)+\left(45-47\right)\)
\(=\left(-2\right)+\left(-2\right)+...+\left(-2\right)+\left(-2\right)\)
\(=-2\cdot12=-24\)
i: \(=173+27-46-54-19=200-100-19=100-19=81\)
k: \(=-52+82+49-15+13-36\)
\(=30+34-23\)
=30+11
=41
l: \(=\left(3-5\right)+\left(7-9\right)+\left(11-13\right)+\left(15-17\right)\)
\(=\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)\)
=-8
m: \(=\left(1-2\right)+\left(3-4\right)+...+\left(2001-2002\right)+2003\)
\(=2003-1-1-...-1\)
\(=2003-1001=1002\)
n:Số số hạng là:
\(\left[\left(-51\right)-\left(-99\right)\right]:1+1=49\left(số\right)\)
Tổng là \(\left(-51-99\right)\cdot\dfrac{49}{2}=-3675\)
o: \(=-62-38+1523-2523-92\)
\(=-100+1000-92=900-92=808\)
3mm=0.3cm
2hm=0.2km
8dm=0.8m
5mm=0.005
5cm=0.5m
13m=0.13m
2731cm=27m31cm
4005mm=40dm5mm
3mm = 3/10cm = 0, 3cm
2hm = 2/10km = 0, 2km
8dm = 8/10m = 0, 8m
5mm = 5/1000m = 0, 005m
5cm = 5/100m = 0, 05m
13m = 13/100hm = 0, 13hm
3cm 1mm = 31/1000m = 0, 031m
13 013m = 13km 13m
2731cm = 27m 31cm
4005mm = 40dm 5mm
a) 1 cm = 10 mm 1 dm = 10 cm = 100 mm 1 m = 10 dm = 100 cm = 1000mm |
2 cm = 20 mm 3 dm = 30 cm = 300 mm 4m = 40 dm = 400 cm = 4000mm |
b) 1 kg = 1000 g 1000 g = 1 kg 2 kg = 2000 g | c) 1 l = 1000 ml 1000 ml = 1 l 3 l = 3000 ml |
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
8 m 91 cm = 8.91m
6 m 3 cm = 6,03m
5 m 3 mm = 5,003 m
8 m 3 dm = 8.3m
1750 mm = 1.75m
234,5 cm = 2,345 m
12 cm = 0.12 m
5,5 m = 550 cm
5,32 m = 532cm
9,375 m = 937.5 cm
9 m 81 cm = .981cm
6 mm = 0.6cm
3,7 dm =37 cm
0,05 m =5 cm
8,91m
6,03m
5,003m
8,3m
1,75m
2,345m
0,12m
550cm
532cm
937,5cm
981cm
0,6cm
37cm
5cm
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
720 m + 43 m = 763 m
403cm – 52 cm = 351 cm
27 mm : 3 = 9 mm