\(=\dfrac{\left(0.125\cdot2.4\right)^5}{\left(-0.3\right)^3\cdot\left(0.01\right)^3\cdot\left(-0.3\right)^2}=-\dfrac{\left(0.3\right)^5}{\left(0.3\right)^5\cdot\left(0.01\right)^3}\)
\(=-\dfrac{1}{\left(0.01\right)^3}=-\dfrac{1}{\dfrac{1}{1000000}}=-1000000\)
BT5: Tính giá trị biểu thức:
a) \(\dfrac{25^2\cdot4^2}{5^5\cdot\left(-2\right)^5}=\)
b) \(\dfrac{\left(0,125\right)^5\cdot\left(2,4\right)^5}{\left(-0,3\right)^5\cdot\left(0,01\right)^3}=\)
BÀI 2 TÍNH
A = \(\dfrac{20^5.5^{10}}{100^5}\)
B = \(\dfrac{\left(0,9\right)^5}{\left(0,3\right)^6}\)
Tính :
a) \(\left(\dfrac{1}{5}\right)^5.5^5\)
b) \(\left(0,125\right)^3.512\)
c) \(\left(0,25\right)^4.1024\)
Tính
\(a.\left(\dfrac{3}{7}+\dfrac{1}{2}\right)^2;b.\left(\dfrac{3}{4}-\dfrac{5}{6}\right)^2;c.\dfrac{5^4.20^4}{25^5.4^5};c.\left(\dfrac{-10}{3}\right)^5.\left(\dfrac{-6}{5}\right)^4\)
\(\left(-\dfrac{1}{3}\right).\left(\dfrac{1}{3}\right)+\left(\dfrac{15}{2}\right)^7:\left(\dfrac{15}{2}\right)^5-\left(\left(-2\right)^2\right)^3\)
Trong vở bài tập của bạn Dũng có bài làm sau :
a) \(\left(-5\right)^2.\left(-5\right)^3=\left(-5\right)^6\)
b) \(\left(0,75\right)^3:0,75=\left(0,75\right)^2\)
c) \(\left(0,2\right)^{10}:\left(0,2\right)^5=\left(0,2\right)^2\)
d) \(\left[\left(-\dfrac{1}{7}\right)^2\right]^4=\left(-\dfrac{1}{7}\right)^6\)
e) \(\dfrac{50^3}{125}=\dfrac{50^3}{5^3}=\left(\dfrac{50}{5}\right)^3=10^3=1000\)
Hãy kiểm tra lại các đáp số và sửa lại chỗ sai (nếu có)
f) \(\dfrac{8^{10}}{4^8}=\left(\dfrac{8}{4}\right)^{10-8}=2^2\)
Bài 50. Tính :
a)\(\left(\dfrac{1}{5}\right)^5.5^5\);
b)\(\left(0,125\right)^3.512\);
c)\(\left(0,25\right)^4.1024\).
tìm x biết
a) \(\dfrac{2}{5}-\left(\dfrac{1}{10}-x\right)=\left(\dfrac{-2}{5}-\dfrac{1}{2}\right)^2\)
b) \(\dfrac{2}{5}-\dfrac{3}{5}\left(x-2\right)=\left(\dfrac{-1}{2}\right)^3-\left(\dfrac{3}{4}\right)^3.\left(-2\right)^2\)
BT4:Tìm x, biết:
a) \(x\div\left(\dfrac{3}{4}\right)^3=\left(\dfrac{3}{4}\right)^2\)
b) \(\left(\dfrac{2}{5}\right)^5\div x=\left(\dfrac{2}{5}\right)^8\)
