\(\left(\dfrac{1}{2}\right)^3.\left(-2\right)^2-25\%+\dfrac{3}{5}.25-30\\ =\dfrac{1}{2}.\left(\dfrac{1}{2}\right)^2.\left(-2\right)^2-\dfrac{25}{100}+\dfrac{3}{5}.25-30\\ =\left(\dfrac{1}{2}\right).\left[\dfrac{1}{2}.\left(-2\right)\right]^2-\dfrac{1}{4}+15-30\\ =\dfrac{1}{2}.\left(-1\right)^2-\dfrac{1}{4}+15-30\\ =\dfrac{1}{2}-\dfrac{1}{4}+15-30\\ =\dfrac{1}{4}+15-30=\dfrac{61}{4}-30=-\dfrac{59}{4}\)

a: \(=\dfrac{2^9\cdot5^9\cdot3^{40}}{2^{12}\cdot5^{10}\cdot3^{20}}=\dfrac{3^{20}}{5\cdot2^3}\)

b: \(=\dfrac{-3^8\cdot2^{10}\cdot5^6}{2^9\cdot\left(-1\right)\cdot3^6\cdot5^7}=\dfrac{-2}{5}\cdot3^2=-\dfrac{18}{5}\)

c: \(=\dfrac{3^{186}\cdot5^{100}}{5^{100}\cdot3^{187}}=\dfrac{1}{3}\)

5.25 = ...25.25.25.285.231 =

5.25 = \(\dfrac{1}{5.25.285.231}\).25.5 .(5.25.285.231)= 125

ủa

6,25

**** cho mình nha nguời bí mật

1+5.25=126

tick nha

sai rồi dấu . là dấu x

vậy 1+5x25=126

\(-14:4,1=-7x:5.25\)
\(-7x:5.25=-\frac{140}{41}\)
\(-7x:5=-\frac{140}{41}:25\)
\(-7x:5=-\frac{140}{41}.\frac{1}{25}\)
\(-7x:5=-\frac{28}{205}\)
\(-7x=-\frac{28}{205}.5\)
\(-7x=-\frac{28}{41}\)
\(\Rightarrow x=-\frac{28}{41}:-7\)
\(x=-\frac{28}{41}.-\frac{1}{7}\)
\(x=\frac{4}{41}\)
Vậy x=4/41
Chúc bạn học tốt

trước khi làm cho mik hỏi dấu " * " là nhân còn dấu " . " là phẩy phải không?

1834,434

tsukino usagi đúng đó bạn

giaiar ra hộ mình nhé

Bài này tính hay tính nhanh vậy bạn !!!

\(=\dfrac{3^8\cdot2^{10}\cdot5^6}{2^9\cdot3^6\cdot5^7}=3^2\cdot\dfrac{2}{5}=\dfrac{18}{5}\)

\(\dfrac{9^4\cdot4^5\cdot25^3}{8^3\cdot27^2\cdot5^7}\)

\(=\dfrac{\left(3^2\right)^4\cdot\left(2^2\right)^5\cdot\left(5^2\right)^3}{\left(2^3\right)^3\cdot\left(3^3\right)^2\cdot5^7}\)

\(=\dfrac{3^8\cdot2^{10}\cdot5^6}{2^9\cdot3^6\cdot5^7}\)

\(=\dfrac{3^2\cdot2\cdot1}{1\cdot1\cdot5}\)

\(=\dfrac{18}{5}\)