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a)
12dam2 30m2 = 12,30dam2
5km2 155dam2 = 5,0155km2
8m2 7dm2 = 8,7m2
b)
78dm2 5cm2 = 78,5dm2
6m2 5cm2 = 6,0005m2
~HT~
Ta có :
729 = 9 x 9 x 9
Suy ra cạnh của HLP trên là : 9m
Diện tích xung quanh của HLP đó là :
9 x 9 x 4 = 324 (m2)
Đ/s :.....
Ta có
S = a.b
S mới
=>a . ( b + 6 ) = S + 240 m2
=> a.b + a.6 = S + 240 m2
Ta lấy S mới trừ đi S cũ đc a . 6 = 240 m2 => a = 40 m
Mặt khác nếu
( a - 6 ) . ( b + 6 ) = S + 6m2
(40 - 6 ) . ( b + 6 ) = S + 6m2
=> 34 . ( b + 6 ) = S + 6m2
=> 34 . b + 34 . 6 = S + 6m2
=> 34.b + 204 = S + 6m2 => S = 34 . b + ( 204- 6 ) => S = 34. b + 198 = 40 . b
=> 34. b + 198 = 40 . b
=> 198 = 6b
=> b = 33 => S = 40 . 33 = 1320 m2
15m 8cm = 15,08 m
56 dm2 21cm2 = 56,21 dm2
12 tấn 6kg =12,006 tấn
6m2 5cm2= 6,02 m2
15m 8cm = 15,08 m
56dm2 21cm2 = 5621 dm2
12 tấn 6 kg = 12006 tấn
6m2 5cm2 = 60005 m2
29,83 = 29 m 83 cm
13,5m2 = 13 m2 50 dm2
a. 135 m = 1350 dm
375 cm = 3,75 m
4 km 37 m = 4037 m
345 dm= 30 m 45 dm
b.19 yến = 190 kg
203k g = 0,203 tấn
2006 g = 2 kg 6 g
3 tấn 7 yến = 3070 kg
c.5 cm2 = 500 mm2
6 m2 35 dm2 = 6,35 m2
20006 m2 =200 dam2 6 m2
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\(6m^25cm^2=6,0005m^2\)
6m25cm2=6,0005m2