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26 m2 = 0,26 dam2
17 cm2 = 1700 mm2
2100 mm2 = 21 cm2
37 dam2 9 m2 = 3709 m2
15 m2 = 15 000 cm2
7 km2 5 hm2 = 70 005 dam2
2 m2 12 cm2 = 20 012 cm2
26 m2 = 0,26 dam2
17 cm2 = 1.700 mm2
2.100 mm2 = 21 cm2
37 dam2 9 m2 = 3.709 m2
15 m2 = 150.000 cm2
7 km2 5 hm2 = 70.500dam2
2 m2 12 cm2 = 20.012 cm2
Chúc bạn học tốt.
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\(\left(\frac{980:2}{1000}-0,25\right)\times\frac{125}{423}=\left(\frac{490}{1000}-0,25\right)\times\frac{125}{423}\)
\(=\left(0,49-0,25\right)\times\frac{125}{423}=0,24\times\frac{125}{423}=\frac{6}{25}\times\frac{125}{423}=\frac{10}{141}\)
\(\left(\frac{980:2}{1000}-0,25\right).\frac{125}{423}\)
=\(\left(\frac{49}{100}-\frac{1}{4}\right).\frac{125}{423}\)
=\(\left(\frac{49-25}{100}\right).\frac{125}{423}\)
=\(\frac{6}{25}.\frac{125}{423}\)
=\(\frac{6.125}{25.423}\)
= \(\frac{10}{141}\)
\(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
=\(\frac{13}{15}+\frac{13}{35}+\frac{13}{63}+\frac{13}{99}\)
=\(13\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+\frac{1}{99}\right)\)
=\(13.\frac{1}{2}\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\right)\)
=\(\frac{13}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right)\)
=\(\frac{13}{2}.\left(\frac{1}{3}-\frac{1}{11}\right)\)
= \(\frac{13}{2}.\frac{8}{33}\)
=\(\frac{52}{33}\)
( 137 x 57 + 687 x 86 ) : ( 26 x 13 + 74 x 16 )
= ( 7809 + 59082 ) : ( 338 + 1184 )
= 66891 : 1522
= 43.94940867279895
687 + 980 = 1667
Đ/s : 1667