1) \(\left(x+0,7\right)^3=-27\Leftrightarrow\left(x+0,7\right)^3=\left(-3\right)^3\Leftrightarrow x+0,7=-3\Leftrightarrow x=-3,7\)2) \(\left(2x-1\right)^{10}=49^5\Leftrightarrow\left(2x-1\right)^{10}=\left(7^2\right)^5\)
\(\Leftrightarrow\left(2x-1\right)^{10}=7^{10}\)
\(\Leftrightarrow2x-1=7\Leftrightarrow x=4\)
mấy câu khác tương tự
4. Tìm x biết:
a) (3x - 7)5 = 0;
b) \(\frac{1}{4}\) - (2x - 1)2 = 0;
c) \(\frac{1}{16}\) - (5 - x)3 = \(\frac{31}{64}\);
d) 2x = (3,8)3 : (-3,8)2;
e) \(\left(\frac{27}{64}\right)^9\). x = \(\left(-\frac{3}{4}\right)^{32}\);
f) \(5^{\left(x+5\right)\left(x^2-4\right)}\) = 1;
g) (x - 2,5)2 = \(\frac{4}{9}\);
h) \(\left(2x+\frac{1}{3}\right)^3=\frac{8}{27}\)
a,\(\frac{-1}{24}-\left[\frac{1}{4}-\left(\frac{1}{2}-\frac{7}{8}\right)\right]\)
b,\(\left[\frac{5}{7}-\frac{7}{5}\right]-\left[\frac{1}{2}-\left(\frac{-2}{7}-\frac{1}{10}\right)\right]\)
c,\(\left(\frac{-1}{2}\right)-\left(\frac{-3}{5}\right)+\left(\frac{-1}{9}\right)+\frac{1}{71}-\left(\frac{-2}{7}\right)+\frac{4}{35}-\frac{7}{8}\)
d,\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5-\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
e,\(\left(\frac{1}{2}-\frac{13}{14}\right):\frac{5}{7}-\left(\frac{-2}{21}+\frac{1}{7}\right):\frac{5}{7}\)
g,\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}:\left(\frac{-1}{7}\right)\)
Bài 1: Tìm x, biết
\(a,\frac{2}{3}-\frac{1}{3}.\left(x-\frac{3}{2}\right)-\frac{1}{2}.\left(2x+1\right)=5\)
\(b,\left(x+\frac{1}{2}\right).\left(x-\frac{3}{4}\right)=0\)
\(c,\left(2x-5\right)^4=81\)
\(d,3^{x+1}+3^{x+3}=810\)
bài 2
q,\(\frac{11}{3}-\left(\frac{5}{42}-x\right)\)
b,\(x+\frac{1}{3}=\frac{2}{5}-\left(\frac{-1}{3}\right)\)
c,\(\frac{-2}{3}x+\frac{5}{7}=\frac{3}{10}\)
d,\(\frac{3}{7}-x=\frac{1}{4}-\left(\frac{-3}{5}\right)\)
a,\(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\)
b,\(\left(\frac{-1}{3}+\frac{5}{6}\right).11-7\)
c,\(\left(\frac{-5}{9}\right).\frac{3}{11}+\left(\frac{-13}{18}\right).\frac{3}{11}\)
d,\(\left(\frac{-2}{3}\right).\frac{3}{11}+\left(\frac{-13}{18}\right).\frac{3}{11}\)
giúp mình với làm ơn
Tìm x
a, \(3^{x+2}-3^{x+1}=162\)
b,\(5^{x+2}-2.5^{x+1}=375\)
c, \(\left(\frac{8}{27}\right)^x=\left(\frac{2}{3}\right)^{-12}\)
d, \(\left(2x+1\right)^3=-64\)
Giúp mik với nha
Bài 1: Tính giá trị các biểu thức sau
a,\(\left[2^{-3}-\left(\frac{3}{4}\right)^{-4}.\left(-\frac{1}{2}\right)^2\right]:\left[5-3\left(\frac{4}{15}\right)^0\right]^{-2}\)
b, \(\frac{2^3+3.2^6-4^3}{2^3+3^2}\)
c, \(\frac{5^5.20^3-5^4.20^3+5^7.4^5}{\left(20+5\right)^3.4^5}\)
d, \(\frac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)
e, \(\frac{5.\left(3.7^{15}-19.7^{14}\right)}{7^{16}+3.7^{15}}\)
f, \(\frac{3^3.\left(0,5\right)^5}{\left(1,5\right)^4}\)
Mk cần gấp
bài3
a,\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
b,\(2x.\left(x\frac{-1}{7}\right)=0\)
c,\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)
bài 4:
a,|x-1,5|=2 b,|\(x+\frac{4}{15}\)|-|-3,75|=-|-2,15|
c,|\(x+\frac{3}{4}\)| - \(\frac{1}{2}\)=0
Tính giá trị biểu thức
\(\left(\frac{2}{5}-\frac{1}{2}\right)^2+\left(\frac{1}{2}+\frac{3}{5}\right)^2\)
