\(8.\sqrt{x} -3\sqrt{\dfrac{4}{81}}= 5,2 \)
\(8.\sqrt{x} - 3. \dfrac{2}{9}=5,2\)
\(8.\sqrt{x} - \dfrac{2}{3}= 5,2\)
\(8.\sqrt{x}= 5,2+ \dfrac{2}{3}\)
\(8.\sqrt{x}= \dfrac{88}{15}\)
\(\sqrt{x}= \dfrac{88}{15}: 8\)
\(\sqrt{x}= \dfrac{11}{15}\)
\(\sqrt{x}= \sqrt{ {\dfrac{121}{225}}}\)
\(\Rightarrow x= \dfrac{121}{225}\)
Chúc bạn học tốt
a, \(\left(18\dfrac{1}{3}:\sqrt{225}+8\dfrac{2}{3}.\sqrt{\dfrac{49}{4}}\right)\): \(\left[\left(12\dfrac{1}{3}+8\dfrac{6}{7}\right)-\dfrac{\left(\sqrt{7}\right)^2}{\left(3\sqrt{2}\right)^2}\right]\): \(\dfrac{1704}{445}\)
b, \(\dfrac{1}{1.2}\)+\(\dfrac{1}{2.3}\)+...+\(\dfrac{1}{99.100}\)
c, \(\left(1-\dfrac{1}{2}\right)\)x\(\left(1-\dfrac{1}{3}\right)\)x.....x\(\left(1-\dfrac{1}{n+1}\right)\) (n ϵ N)
d, -66 x \(\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)\) + 124 x -37 + 63 x -124
e, \(\dfrac{7}{4}\) x \(\left(\dfrac{33}{12}+\dfrac{3333}{2020}+\dfrac{333333}{303030}+\dfrac{33333333}{42424242}\right)\)
\(\left\{\left[\left(2\sqrt{2}\right)^2:2,4\right]X\left[5,25:\left(\sqrt{7}\right)^2\right]\right\}\) : \(\left\{\left[2\dfrac{1}{7}:\dfrac{\left(\sqrt{5}\right)^2}{7}\right]:\left[2^2:\dfrac{\left(2\sqrt{2}\right)^2}{\sqrt{81}}\right]\right\}\)
b, tìm x, y, z thoả mãn đẳng thức
\(\sqrt{\left(x-\sqrt{2}\right)^2}\) + \(\sqrt{\left(y+\sqrt{2}\right)^2}\) + |x + y + z| = 0
\(a)(x^2-3)(2x^2-\dfrac{9}{8})(\sqrt{|x|}-\sqrt{\dfrac{5}{2}})=0\)
\(b)x-5\sqrt{x}=0\)
B1
a,\(\dfrac{7}{3}\).\(\dfrac{37}{5}\)-\(\dfrac{7}{3}\).\(\dfrac{32}{5}\)
b, 3:+\(\left(-\dfrac{3}{2}\right)^2\)+ \(\dfrac{1}{9}\).\(\sqrt{36}\)
c,\(\left(-2\right)^2\) + \(\sqrt{36}\)-\(\sqrt{9}\)+\(\sqrt{25}\)
d, \(\left(-\dfrac{2}{3}+\dfrac{3}{7}\right)\) : \(\left(-\dfrac{1}{3}+-\dfrac{4}{7}\right):\dfrac{4}{5}\)
B2
a, \(\dfrac{3}{4}\)+\(\dfrac{1}{4}\):x = \(\dfrac{1}{2}\)
b, -8 + 2 . |2x-3| =4
c, |x - \(\dfrac{1}{3}\)|- \(\sqrt{\dfrac{1}{6}}\)=\(\sqrt{\dfrac{1}{9}}\)
Tính giá trị của \(\dfrac{4x}{\sqrt{x}-3}\) biết x = \(6-4\sqrt{2}\)
tìm các số nguyên x để biểu thức sau có giá trị nguyên
a, A = \(\dfrac{7}{\sqrt{x}}\)
b, B = \(\dfrac{3}{\sqrt{x-1}}\)
c, C = \(\dfrac{2}{\sqrt{x-3}}\)
Bài 4: Cho\(\dfrac{25+x}{9}\) = \(\dfrac{51-y}{16}\) = \(\dfrac{70+z}{25}\) với\(\sqrt{9}\) . y3 -\(\sqrt{16}\) = 7.\(\sqrt{121}\)
Tính x + y + z
Help me! Thanks a lot!
a, cho A = \(\dfrac{\sqrt{x+1}}{\sqrt{x-3}}\). tìm x để A có giá trị nguyên ( x ϵ Z)
b, Thực hiện phép tính: {[(2\(\sqrt{2}\))\(^2\) : 2,4] x [5,25 : (\(\sqrt{7}\))\(^2\)]} : {[2\(\dfrac{1}{7}\) : \(\dfrac{\left(\sqrt{5}\right)^2}{7}\)] : [2\(^2\) : \(\dfrac{\left(2\sqrt{2}\right)^2}{\sqrt{81}}\)]}
tính hợp lý
a, A = \(\dfrac{1-\dfrac{1}{\sqrt{49}}+\dfrac{1}{49}-\dfrac{1}{\left(7\sqrt{7}\right)^2}}{\dfrac{\sqrt{64}}{2}-\dfrac{4}{7}+\left(\dfrac{2}{7}\right)^2-\dfrac{4}{343}}\)
b, M = 1 - \(\dfrac{5}{\sqrt{196}}\) - \(\dfrac{5}{\left(2\sqrt{21}\right)^2}\) - \(\dfrac{\sqrt{25}}{204}\) - \(\dfrac{\left(\sqrt{5}\right)^2}{374}\)