a)

\(5dm=\dfrac{5}{10}m=0.5m\)

\(15cm=\dfrac{15}{100}m=0.15m\)

b) 

\(1h12'=1\dfrac{1}{5}h=\dfrac{6}{5}h\)

\(2h15'=2\dfrac{1}{4}h=\dfrac{9}{4}h\)

a,5 dm=\(\dfrac{5}{10}m=0,5m\);\(15cm=\dfrac{15}{100}m=0,15m\).

b,\(1h12p=1\dfrac{1}{5}h=\dfrac{6}{5}h\);\(2h15p=2\dfrac{1}{4}h=\dfrac{9}{4}h\).

Đáp án cần chọn là: B

Ta có:  20 d m 2 = 20 100 m 2

B

Đáp án cần chọn là: B

500 c m 2 = 500 10000 m 2

B

a: 15cm=0,15m

40mm=0,04m

b: 15cm²=0,0015m²

35dm²=0,35m²

a: 47 phút=\(\frac{47}{60}\) giờ

125 phút=\(\frac{125}{60}\) giờ=\(\frac{25}{12}\) giờ

235 giây=\(\frac{235}{3600}\) giờ=\(\frac{47}{720}\) giờ

49 giây\(=\frac{49}{3600}\) giờ

b: \(47dm^2=\frac{47}{100}m^2\)

\(124dm^2=\frac{124}{100}m^2=\frac{31}{25}m^2\)

\(1256\operatorname{cm}^2=\frac{1256}{10000}m^2=\frac{157}{1250}m^2\)

\(45\operatorname{cm}^2=\frac{45}{10000}m^2=\frac{9}{2000}m^2\)

c: 27cm=27/100m

125mm=125/1000m=1/8m

345dm=345/10m=69/2m

48dm=48/10m

d: \(43\left(gam\right)=\frac{43}{1000}\left(\operatorname{kg}\right)\)

\(165\left(gam\right)=\frac{165}{1000}\left(\operatorname{kg}\right)\)

a ) 3 10 ; 11 100 ; 213 1000 . b ) 7 100 ; 129 10000 c ) 521 1000 .

a) 29 cm = \(\frac{29}{100}\)m

b) 43 g = \(\frac{43}{1000}\)kg

Hok tốt!