7,8cm=...................dm
97,2m=...................cm
7,8mm=..................m
2dam=...................hm
2,7m2=.................dm2
9,78km2=..............dam2
K
Khách
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Những câu hỏi liên quan
ND
Nguyễn Đức Trí
VIP
16 tháng 7 2023
\(2dam^216m^2=2,16dam^2\)
\(\)\(46dam^25m^2=46,95dam^2\)
\(3km^24cm^2=30000,0004dam^2\)
\(32dam^29m^2=32,09dam^2\)
\(8dam^262m^2=8,62dam^2\)
\(16dam^229m^2=16,29dam^2\)
\(52dam^240m^2=52,4dam^2\)
\(13hm^224dm^2=1300,0024dam^2\)
16 tháng 7 2023
16m2 = 1.6dam2
46dam2 5m2 = 465m2
3km2 4cm2 = 30004dam2
32dam2 9m2 = 329.9dam2
8dam2 62m2 = 862m2
16 dam2 29m2 = 1629m2
52dam2 40m2 = 5240m2
13hm2 24dm2 = 1324dam2
C
17 tháng 5 2022
Chiều cao của hình thang là
\(\dfrac{30,15\times2}{7,8+5,6}=4,5\left(cm\right)\)
HQ
Hà Quang Minh
Giáo viên
14 tháng 9 2023
Ta có:
\(\frac{{EF}}{{NP}} = \frac{{7,8}}{{13}} = \frac{3}{5};\frac{{DE}}{{MN}} = \frac{6}{{10}} = \frac{3}{5}\)
Xét tam giác \(DEF\) và tam giác \(MNP\) ta có:
\(\frac{{EF}}{{NP}} = \frac{{DE}}{{MN}} = \frac{3}{5}\)
\(\widehat E = \widehat N\) (giải thuyết)
Do đó, \(\Delta DEF\backsim\Delta MNP\) (c.g.c)
Do đó, \(\widehat F = \widehat P = 42^\circ \).
CM
9 tháng 11 2017
67 dam2 51m2 = 67 dam2 + 
m2 = 
dam2
82 dam2 7m2 = 82dam2 + 
m2 = 
dam2
DB
10 tháng 12 2021
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U
NN
4
4 tháng 2 2017
Chu vi hình tròn là: 19 x 3,14 = 59,66 (cm)
Diện tích hình tròn là: 7,8 x 7,8 x 3,14 = 191,0376 (cm2)
7,8cm=0,78 dm
97,2m=9720cm
7,8mm=0,0078
2dam=0,2 hm
2,7m2=270dm2
9,78km2=97800dam2