Rút gọn:
a) \frac{5500-25}{4400-20}=4400−205500−25=
b) \frac{2040+15}{3400+25}=3400+252040+15=
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\(\frac{-63}{108}\)= \(\frac{-7}{12}\)
\(\frac{-33}{-77}\)= \(\frac{3}{7}\)
\(\frac{-5}{10}\)=\(\frac{-1}{2}\)
\(\frac{14}{63}\)=\(\frac{2}{9}\)
\(\frac{-15}{25}\)=\(\frac{-3}{5}\)
\(\frac{-45}{18}\)=\(\frac{-5}{2}\)
\(\frac{12}{15}\)=\(\frac{4}{5}\)
\(\frac{20}{25}\)=\(\frac{4}{5}\)
\(\frac{31}{12}\):Là phân số tối giản
t.i.c.k nha
\(A=\frac{4^{15}.5^{15}.3^{12}.5^{12}}{5^{28}.2^{14}.3^{14}.2^{15}}=\frac{2.2^{29}.5^{27}.3^{12}}{5.5^{27}.2^{29}.3^{12}.3^2}=\frac{2}{45}\)
\(A=\frac{20^{15}.15^{12}}{25^{14}.6^{14}.8^5}=\frac{\left(2^2.5\right)^{15}.\left(3.5\right)^{12}}{\left(5^2\right)^{14}.\left(2.3\right)^{14}.\left(2^3\right)^5}=\frac{\left(2^2\right)^{15}.5^{15}.3^{12}.5^{12}}{5^{28}.2^{14}.3^{14}.2^{15}}\)
=\(\frac{2^{30}.3^{12}.5^{15}.5^{12}}{5^{28}.3^{14}.2^{14}.2^{15}}=\frac{2^{30}.3^{12}.5^{27}}{5^{28}.3^{14}.2^{29}}=\frac{2}{5.3^2}=\frac{2}{45}\)
(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!
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)\(\frac{15.11-15}{25.\left(-10\right)}\)
\(=\frac{15.\left(11-1\right)}{25.\left(-10\right)}\)
\(=\frac{15.10}{25.\left(-10\right)}\)
\(=\frac{3.1}{5.\left(-1\right)}\)
\(=\frac{-3}{5}\)
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