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(-0,2)4 . (-0,2 )5 =
=(-0,2)4+5
=(-0,2)9
Xong!!! Chúc bạn học tốt!!
a,\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0,2\right)\)
\(=\left(\dfrac{9}{25}-36\right):\left(\dfrac{19}{5}+0,2\right)\)
\(=-\dfrac{891}{25}:4\)
\(=-\dfrac{891}{100}\)
b,\(\dfrac{5^4.20^4}{25^5.4^5}\)
\(=\dfrac{5^4.20^4}{\left(5^2\right)^5.\left(2^2\right)^5}\)
\(=\dfrac{5^4.20^4}{5^{10}.2^{10}}\)
\(=\dfrac{20^4}{5^6.2^{10}}\)
Cau a la 1
Cau b la 1215
Cau c la 768
Cau d la \(\frac{4185}{13}\)
\(\frac{4^2.4^3}{2^{10}}=\frac{4^{2+3}}{\left(2^2\right)^5}=\frac{4^5}{4^5}=1\)
\(\frac{\left(0,6\right)^5}{\left(0,2\right)^6}=\frac{\left(0,2.3\right)^5}{\left(0,2\right)^6}=\frac{\left(0,2\right)^5.3^5}{\left(0,2\right)^6}=\frac{3^5}{0,2}=1215\)
\(\frac{2^7.9^3}{6^5.8^2}=\frac{2^2.2^5.\left(3^2\right)^3}{\left(2.3\right)^5.\left(2^3\right)^2}=\frac{2^2.2^5.3^6}{2^5.3^5.2^6}=\frac{3}{2^4}=\frac{3}{16}\)
\(\frac{6^3+3.6^2+3^3}{-13}=\frac{2^3.3^3+3.\left(2.3\right)^2+3^3}{-13}=\frac{2^3.3^3+3.2^2.3^2+3^3}{-13}=\frac{3^3.\left(2^3+2^2+1\right)}{-13}=\frac{3^3.13}{-13}=\left(-3\right)^3=-27\)
a,
\(\dfrac{4^2\cdot4^3}{2^{10}}=\dfrac{4^5}{2^{10}}=\dfrac{\left(2^2\right)^5}{2^{10}}=\dfrac{2^{10}}{2^{10}}=1\)
b,
\(\dfrac{\left(0,6\right)^5}{\left(0,2\right)^6}=\dfrac{\left(0,2\cdot3\right)^5}{\left(0,2\right)^5\cdot0,2}=\dfrac{\left(0,2\right)^5\cdot3^5}{\left(0,2\right)^5\cdot0,2}=\dfrac{243}{0,2}=\dfrac{243}{\dfrac{1}{5}}=243\cdot5=1215\)
c,
\(\dfrac{2^7\cdot9^3}{6^5\cdot8^2}=\dfrac{2^7\cdot\left(3^2\right)^3}{\left(2\cdot3\right)^5\cdot\left(2^3\right)^2}=\dfrac{2^6\cdot2\cdot3^6}{2^5\cdot3^5\cdot2^6}=\dfrac{3}{2^4}=\dfrac{3}{16}\)
d,
\(\dfrac{6^3+3\cdot6^2+3^3}{-13}=\dfrac{\left(2\cdot3\right)^3+3\cdot\left(2\cdot3\right)^2+3^3}{-13}=\dfrac{2^3\cdot3^3+3\cdot2^2\cdot3^2+3^3}{-13}=\dfrac{2^3\cdot3^3+2^2\cdot3^3+3^3}{-13}\dfrac{3^3\left(2^3+2^2+1\right)}{-13}=\dfrac{3^3\cdot13}{-13}=-3^3=-27\)
\(\left(\frac{3}{4}-0,2\right)\left(0,4-\frac{3}{5}\right)=\frac{11}{20}.\left(\frac{-1}{5}\right)=-\frac{11}{100}\)
\(2-\left(\frac{-3^0}{4}\right)+\left(\frac{1^2}{2}\right):\frac{5}{2}=2-\frac{-1}{4}+\frac{1}{5}=-\frac{1}{20}\)
\(\sqrt{4}=2;\sqrt{25}=5;\sqrt{100}=10\)
−0.25 =0
~ chúc hok tốt, giỏi, đứng nhất lớp luôn ~
thanks bạn mik nha