\(\frac{-63}{108}\)= \(\frac{-7}{12}\)

\(\frac{-33}{-77}\)= \(\frac{3}{7}\)

\(\frac{-5}{10}\)=\(\frac{-1}{2}\)

\(\frac{14}{63}\)=\(\frac{2}{9}\)

\(\frac{-15}{25}\)=\(\frac{-3}{5}\)

\(\frac{-45}{18}\)=\(\frac{-5}{2}\)

\(\frac{12}{15}\)=\(\frac{4}{5}\)

\(\frac{20}{25}\)=\(\frac{4}{5}\)

\(\frac{31}{12}\):Là phân số tối giản

t.i.c.k nha                                           

\(=\left(4400+5500\right)+\left(36+64\right)\\ =9900+100\\ =10000\)

\(4400+5500+36+64=\left(4400+5500\right)+\left(36+64\right)=10000+100=10100\)

\(A=\frac{4^{15}.5^{15}.3^{12}.5^{12}}{5^{28}.2^{14}.3^{14}.2^{15}}=\frac{2.2^{29}.5^{27}.3^{12}}{5.5^{27}.2^{29}.3^{12}.3^2}=\frac{2}{45}\)

\(A=\frac{20^{15}.15^{12}}{25^{14}.6^{14}.8^5}=\frac{\left(2^2.5\right)^{15}.\left(3.5\right)^{12}}{\left(5^2\right)^{14}.\left(2.3\right)^{14}.\left(2^3\right)^5}=\frac{\left(2^2\right)^{15}.5^{15}.3^{12}.5^{12}}{5^{28}.2^{14}.3^{14}.2^{15}}\)

=\(\frac{2^{30}.3^{12}.5^{15}.5^{12}}{5^{28}.3^{14}.2^{14}.2^{15}}=\frac{2^{30}.3^{12}.5^{27}}{5^{28}.3^{14}.2^{29}}=\frac{2}{5.3^2}=\frac{2}{45}\)

(68X75+5X32X150):25-5500:25

=(5100+160X150):25-5500:25

=(5100+24000):25-5500:25

=29100:25-5500:25

=1164-220

=994

\(B=\frac{25^5+25^7+25^9}{5^{11}+5^{13}+5^{15}+5^{17}+5^{19}+5^{21}}\)

\(B=\frac{\left(5^2\right)^5+\left(5^2\right)^7+\left(5^2\right)^9}{5^{11}+5^{13}+5^{15}+5^{17}+5^{19}+5^{21}}\)

\(B=\frac{5^{10}+5^{14}+5^{18}}{5^{11}+5^{13}+5^{15}+5^{17}+5^{19}+5^{21}}\)

\(B=\frac{5^{10}.\left(1+5^4+5^8\right)}{5^{11}.\left(1+5^2+5^4+5^6+5^8+5^{10}\right)}\)

\(B=\frac{1+5^4+5^8}{5.\left[\left(1+5^4+5^8\right)+5^2.\left(1+5^4+5^8\right)\right]}\)

\(B=\frac{1+5^4+5^8}{5.\left[\left(1+5^4+5^8\right).\left(1+5^2\right)\right]}\)

\(B=\frac{1+5^4+5^8}{5.\left(1+5^4+5^8\right).26}\)

\(B=\frac{1}{5.26}\)

\(B=\frac{1}{130}\)

Nhớ k cho m nha 

125x145x8

=125x8x145 (tính chất giao hoán)

=1000x145

=145000

4400:4:25

=4400:(25x4)

=4400:100

=44

Mong các bạn khác chọn đúng cho mình!

125 x 145 x 8 = ( 125 x 8 ) x 145 = 1000x 145 = 145 000

a)\(\frac{25-7.25}{6.15}\)

\(=\frac{25.\left(1-7\right)}{6.15}\)

\(=\frac{25.\left(-6\right)}{6.15}\)

\(=\frac{5.\left(-1\right)}{1.3}\)

\(=\frac{-5}{3}\)

b)\(\frac{15.11-15}{25.\left(-10\right)}\)

\(=\frac{15.\left(11-1\right)}{25.\left(-10\right)}\)

\(=\frac{15.10}{25.\left(-10\right)}\)

\(=\frac{3.1}{5.\left(-1\right)}\)

\(=\frac{-3}{5}\)

Ok thanks bn

cho bn 3

Hi

a) \(\frac{25-7.25}{6.15}=\frac{25.1-7.25}{6.15}=\frac{25.\left(1-7\right)}{6.15}=\frac{5.5.\left(-6\right)}{2.3.3.5}=\frac{5.5.3.\left(-2\right)}{2.3.3.5}=\frac{-5}{3}\)

b) \(\frac{15.11-15}{25.\left(-10\right)}=\frac{15.\left(11-1\right)}{25.\left(-10\right)}=\frac{15.10}{25.\left(-10\right)}=\frac{3.5.2.5}{5.5.2.\left(-5\right)}=\frac{3}{-5}\)

a) 4 m2 = 40000 cm2     m2 = 50dm2

16 m2 = 1600 dm2     dm2 = 50 cm2

308 dm2 = 30800cm2     m2 = 100 cm2

b) 700 cm2 = 7 dm2    15 m2 9 dm2 = 1509 dm2

3400 dm2 = 34 m2    7 dm2 25 cm2 = 725 cm2

50 000 cm2 = 5 m2    28 m2 50 cm2 = 280050 cm2

c) 948 dm2 = 9 m2 48 dm2    8791 dm2 = 87 m2 91 dm2

705 cm2 = 7 dm2 5cm2     30 045 cm2 = 3 m2 45 cm2

a 4 m² =40000 cm²

b 1/2 m² =50 dm ²

bằng  

4 m²=40000m²