\(\left(\sqrt{x}-1+5\right)\left(x-6\sqrt{x}\right)\)
\(=\left(\sqrt{x}+4\right)\left(x-6\sqrt{x}\right)\)
\(=x\sqrt{x}-6x+4x-24\sqrt{x}\)
\(=x\sqrt{x}-2x-24\sqrt{x}\)
Đề bài?
\(\left(\sqrt{x}-1+5\right)\left(x-6\sqrt{x}\right)\)
\(=\left(\sqrt{x}+4\right)\left(x-6\sqrt{x}\right)\)
\(=x\sqrt{x}-6x+4x-24\sqrt{x}\)
\(=x\sqrt{x}-2x-24\sqrt{x}\)
Đề bài?
\(\left(\sqrt{x}-1+5\right)\times\left(x-6\times\sqrt{x}\right)=0\)
\(2\left|2x-6\right|=\dfrac{5}{6}-\left|x-3\right|\)
2:\(\left|x+2013\right|+\left|x+2014\right|+\left|x+2045\right|=2\)
3:\(\left|2x-1\right|=\left|x+1\right|\)
4:\(\sqrt{\left(x+\sqrt{5}\right)}+\sqrt{\left(y-\sqrt{3}\right)^2}+\left|x-y-z\right|=0\)
\(x-2\times\sqrt{x}=0\left(x\ge0\right)\)
1)tính kết quả:
a, A=\(2\times\sqrt{a}-3\times\sqrt{16}+5\times\sqrt{31}\)
b, B=\(\left(\sqrt{\frac{1}{16}}+\sqrt{\frac{4}{25}}\right)\div\sqrt{\frac{25}{36}}\)
c, \(\left(\sqrt{5}\right)^2-\left(2\times\sqrt{3}\right)^2+\left(4\times\sqrt{2}\right)^2\)
Tìm x:
a.\(\frac{1}{3}\times\left(x-1\right)+\frac{2}{5}\times\left(x+1\right)=0\)
b.\(4x-\left(x+\frac{1}{2}\right)=2x-\left(\frac{1}{2}x-5\right)\)
c.\(\left(x+\frac{1}{2}\right)\times\left(x-\frac{3}{4}\right)=0\)
Các bn ơi giúp mk với chiều mk đi học rồi!!!!!!!!!!!!
Tìm x biết
a)\(\sqrt{x^2=x}\)
b)\(\sqrt{x^2=-x}\)
c)\(x\times\sqrt{x-3}=0\)
d)\(\left(x^2-4\right)\times\sqrt{x}=0\)
1. Chứng minh:
\(\frac{1}{2}+\frac{1}{3\sqrt{2}}+\frac{1}{4\sqrt{3}}+\frac{1}{5\sqrt{4}}+...+\frac{1}{2016\sqrt{2015}}<\frac{88}{45}\)
2. Rút gọn: A= \(\left(\frac{1+2x}{4+2x}-\frac{x}{3x-6}+\frac{2x^2}{13-3x^2}\right)\times\frac{24-12x}{6+13x}\)
3, Cho 2x;3y tỉ lệ nghịch với 3,4;x và z tỉ lệ thuận với 4,5; x-2y+3z=1. Tính x-y-z
4. Tìm x: \(\left(2x-3\right)^2-2\left(3x+1\right)^2=2x\left(x-2\right)+\left(x-1\right)\left(x+2\right)\)
\(\frac{\left(\frac{1}{14}-\frac{\sqrt{2}}{7}+\frac{3\sqrt{2}}{35}\right)\times\left(\frac{-4}{15}\right)}{\left(\frac{1}{10}+\frac{3\sqrt{2}}{25}-\frac{\sqrt{2}}{5}\right)\times\frac{5}{7}}\)
tính
\(\left\{\left[\left(2\sqrt{2}\right)^2:2,4\right].\left[5,25:\left(\sqrt{7}\right)^2\right]\right\}:\left\{\left[2\frac{1}{7}:\frac{\left(\sqrt{5}\right)^2}{7}\right]:\left[2^3:\frac{\left(2\sqrt{2}\right)^2}{\sqrt{81}}\right]\right\}\)
tìm x,y,x
\(\sqrt{\left(x-\sqrt{2}\right)^2}+\sqrt{\left(y+\sqrt{2}\right)^2}+\left|x+y+z\right|=0\)
so sánh A và B:
\(A=\sqrt{225}-\frac{1}{\sqrt{5}}-1\) \(B=\sqrt{196}-\frac{1}{\sqrt{6}}\)
ai giải đc câu nào thì giải giúp với