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a) 21: 25 =\(\dfrac{21}{25}\)
30: 43 = \(\dfrac{30}{43}\)
61: 69 = \(\dfrac{61}{69}\)
17: 100 = \(\dfrac{17}{100}\)
b)9 : 4 = \(\dfrac{9}{4}\)
51: 7 = \(\dfrac{51}{7}\)
60 : 39 = \(\dfrac{60}{39}\)
200 : 163 = \(\dfrac{200}{163}\)
a. 17 dam2 5 m2 =1705m2
b. 16 hm2 51 m2 = 16051m2
c. 6542 cm2 = 65 dm242 cm2
d. 203040089 m2 = 20 km2 3 hm2 4 dam2 89 m2
e. 3 dm2 27 cm2 - 36 cm2 = 291 cm2
f. 63 dm2 75 cm2 + 58 dm2 46 cm2 = 1 m2 22 dm2 21 cm2
g. 3 dm2 5 cm2 : 5 = 61 cm2
h. 44 dm2 x 4 = 1 m2 76 dm2
a) 107 x 75 + 107 x 42 – 107 x 17
= 107 x (75 + 42 - 17)
= 107 x 100
= 10700
@admin_OLM
\(\frac{75}{200}\)=\(\frac{3}{8}\); \(\frac{34}{51}\)=\(\frac{2}{3}\);\(\frac{36}{84}\)=\(\frac{3}{7}\); \(\frac{117}{243}\)=\(\frac{13}{27}\)
Đây nha bạn :))
= 25 x 25 + 25 x 75 = 25x (25 + 75) = 25 x 100 = 2500
a) = \(\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right):\dfrac{27}{31}\)
= \(\dfrac{7}{7}\) x \(\dfrac{31}{27}\)
= 1 x \(\dfrac{31}{27}\) = \(\dfrac{31}{27}\)
b) = \(\left(\dfrac{23}{45}:\dfrac{23}{45}\right)\)x \(\dfrac{17}{51}\)
= 1 x \(\dfrac{17}{51}\)= \(\dfrac{17}{51}\)
1) \(=\left(\frac{3}{5}+\frac{2}{5}\right).\frac{6}{11}\)
\(=1.\frac{6}{11}\)
\(=\frac{6}{11}\)
2)\(\frac{17}{25}.\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\)
\(=\frac{17}{25}.1\)
\(=\frac{17}{25}\)
21/27
5/12
3/10
1/3
63/81 = 21/27
25/75 =5/12
60/200 =3/10
17/51 =1/3