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1/10m2=10dm2
1/10dm2=10 cm2
1/10m2=1000cm2
1300dm2=13m2
60000cm2=600dm2
1cm2=0,01dm2
1dm2=0,01m2
1cm2=0,0001m2
850cm2 > 12dm
32m2 92dm2 .<.......4m2
2015m2 ....>....2hm
5dm267m2 . <....6700cm
2302 mm2 ..>.3dm2mm2
51km2 .....>.. 510hm2
32km245m2...>... 3200hm227dm2
34cm2.....<.. 2734cm2
34dm234mm2........>...... 3434cm2
\(a,\frac{2}{3}.y=\frac{3}{5}\)
\(y=\frac{3}{5}:\frac{2}{3}\)
\(y=\frac{9}{10}\)
b, \(\frac{2}{5}:y=\frac{7}{10}\)
\(y=\frac{2}{5}:\frac{7}{10}\)\(y=\frac{4}{7}\)
\(c,\frac{4}{5}-y=\frac{5}{7}\)
\(y=\frac{4}{5}-\frac{5}{7}\)
\(y=\frac{3}{35}\)
\(d,y:\frac{2}{5}+1=\frac{7}{2}\)
\(y:\frac{2}{5}=\frac{5}{2}\)
\(y=\frac{5}{2}.\frac{2}{5}\)
\(y=1\)
a/ 2/3*y=3/5 =>y=3/5:2/3=>y=9/10 b/ thôi giác làm để minh lbt
3km2=3000000m2
1500cm2=15dm2
3m2 20cm2=30020cm2
25m2=2500dm2
20000cm2=2m2
12m25m2=1205dm2
3 km2 = 3000000 m2
1500 cm2 = 15 dm2
3 m2 20 cm2 = 320 cm2
25 m2 = 2500 dm2
20000 cm2 = 2 m2
12 m2 5 dm2 = 125 dm2
2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2=29x2=58
100000000000000 x 2 = 2000000000000
100000000000000*2 = 200000000000000
tick nha