Ôn tập chương 1
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Tìm x biết
a)left(3x+dfrac{1}{3}right)left(x-dfrac{1}{2}right)0
b)left(x-dfrac{3}{2}right)left(2x+1right)0
c)left(2-xright)left(dfrac{4}{5}-xright) 0
d)left(x-dfrac{4}{7}right):left(x+dfrac{1}{2}right)0
e)2left(x+1right)-dfrac{1}{3}.left(x-1right)dfrac{2}{3}
k)left|4x-0,2right|0,2
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Tìm x biết
a)\(\left(3x+\dfrac{1}{3}\right)\left(x-\dfrac{1}{2}\right)=0\)
b)\(\left(x-\dfrac{3}{2}\right)\left(2x+1\right)>0\)
c)\(\left(2-x\right)\left(\dfrac{4}{5}-x\right)< 0\)
d)\(\left(x-\dfrac{4}{7}\right):\left(x+\dfrac{1}{2}\right)>0\)
e)\(2\left(x+1\right)-\dfrac{1}{3}.\left(x-1\right)=\dfrac{2}{3}\)
k)\(\left|4x-0,2\right|=0,2\)
a,\(\sqrt{x+1}=7\)
b,(x-2).\(\left(x+\dfrac{2}{3}\right)\)>0
c,\(\left(\dfrac{2}{3}x-1\right).\left(\dfrac{3}{4}x+\dfrac{1}{2}\right)=0\)
Bài 1: Thực hiện phép tính:
a) left(frac{3}{5}right)^2-[frac{1}{3}:3-sqrt{16}.left(frac{1}{2}right)^2]-left(10times12-2014right)^0
b)|-frac{100}{123}|:left(frac{3}{4}+frac{7}{12}right)+frac{23}{123}:left(frac{9}{5}-frac{7}{15}right)
c) frac{left(-5right)^{32}times20^{43}}{left(-8right)^{29}times125^{25}}
Bài 2: Tìm x biết
a)frac{2}{3}-left(frac{3}{4}-xright)sqrt{frac{1}{9}}
b) left(frac{1}{2}-xright)^2left(-2right)^2
c) |3x+frac{1}{2}|-frac{2}{3}1
d) 3^{2x+1}81
Đọc tiếp
Bài 1: Thực hiện phép tính:
a) \(\left(\frac{3}{5}\right)^2-[\frac{1}{3}:3-\sqrt{16}.\left(\frac{1}{2}\right)^2]-\left(10\times12-2014\right)^0\)
b)\(|-\frac{100}{123}|:\left(\frac{3}{4}+\frac{7}{12}\right)+\frac{23}{123}:\left(\frac{9}{5}-\frac{7}{15}\right)\)
c) \(\frac{\left(-5\right)^{32}\times20^{43}}{\left(-8\right)^{29}\times125^{25}}\)
Bài 2: Tìm x biết
a)\(\frac{2}{3}-\left(\frac{3}{4}-x\right)=\sqrt{\frac{1}{9}}\)
b) \(\left(\frac{1}{2}-x\right)^2=\left(-2\right)^2\)
c) \(|3x+\frac{1}{2}|-\frac{2}{3}=1\)
d) \(3^{2x+1}=81\)
Tim x,biet;
a/ \(\left(x-1\right)^2=0\)
b/ \(\left(x-2\right)^2-1=0\)
c/\(\left(2x-1\right)^3=-8\)
d/ \(\left(x+2\right)^2+1=0\)
Cần giúp nhanh vsBài 1. Tìm xa) left|x+dfrac{7}{4}right|dfrac{1}{2}b) left|2x+1right|-dfrac{2}{5}dfrac{1}{3}c) 3x.left(x+dfrac{2}{3}right)0d) x+dfrac{1}{3}dfrac{2}{5}-left(-dfrac{1}{3}right)Bài 2. Tính nhanhAdfrac{1}{100}-dfrac{1}{100.99}-dfrac{1}{99.98}-dfrac{1}{98.97}-....-dfrac{1}{3.2}-dfrac{1}{2.1}
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Cần giúp nhanh vs
Bài 1. Tìm x
a) \(\left|x+\dfrac{7}{4}\right|=\dfrac{1}{2}\)
b) \(\left|2x+1\right|-\dfrac{2}{5}=\dfrac{1}{3}\)
c) \(3x.\left(x+\dfrac{2}{3}\right)=0\)
d) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)\)
Bài 2. Tính nhanh
\(A=\dfrac{1}{100}-\dfrac{1}{100.99}-\dfrac{1}{99.98}-\dfrac{1}{98.97}-....-\dfrac{1}{3.2}-\dfrac{1}{2.1}\)
Tìm x:
a) \(\dfrac{16}{3}:x=\dfrac{50}{12}\left(-0,06\right)\) b) \(2.x-1^3=-8\) c) \(\dfrac{\left(0.8\right)^5}{\left(0.4\right)^6}=x\)
d)\(0,944-2.x=3,268\) e)\(\sqrt{\dfrac{0,09}{25}=-\dfrac{4,7}{5}+x}\) g)\(\sqrt{5^2-3^2}=-\sqrt{81-x}\)
Tìm GTNN của:
a) A left|x-1right|+left|x-2right|+left|x-3right|+left|x-4right|+left|x-5right|
b) B left|x-1right|+left|x-2right|+left|x-3right|+left|x-4right|+left|x-5right|+left|x-6right|
c) C left|x-1right|+left|x-2right|+...+left|x-nright|( n là số lẻ )
d) D left|x-1right|+left|x-2right|+...+left|x-nright|( n là số chẵn )
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Tìm GTNN của:
a) A = \(\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x-4\right|+\left|x-5\right|\)
b) B = \(\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x-4\right|+\left|x-5\right|+\left|x-6\right|\)
c) C = \(\left|x-1\right|+\left|x-2\right|+...+\left|x-n\right|\)( n là số lẻ )
d) D = \(\left|x-1\right|+\left|x-2\right|+...+\left|x-n\right|\)( n là số chẵn )
a)3,6-left|x-0,4right|0
b)frac{x}{2}yfrac{z}{3} và x-2y+z210
c)left|x+0,25right|-4frac{1}{4}
d)x:left(0,25right)^4left(0,5right)^2
e)3^{x-1}+5.3^{x-1}162
f)frac{x}{-25}frac{2}{5}
g)left|x+frac{3}{4}right|-frac{3}{4}sqrt[]{frac{1}{9}}
Đọc tiếp
a)\(3,6-\left|x-0,4\right|=0\)
b)\(\frac{x}{2}=y=\frac{z}{3}\) và \(x-2y+z=210\)
c)\(\left|x+0,25\right|-4=\frac{1}{4}\)
d)\(x:\left(0,25\right)^4=\left(0,5\right)^2\)
e)\(3^{x-1}+5.3^{x-1}=162\)
f)\(\frac{x}{-25}=\frac{2}{5}\)
g)\(\left|x+\frac{3}{4}\right|-\frac{3}{4}=\sqrt[]{\frac{1}{9}}\)
tìm x biết
1)left(1-2xright)^29
2)left(x+5right)^3-64
3)left(3x-5right)^216
4) left(x-1right)^327
5)x^2+x0
6)5^{x+2}625
7) 5-left|3x-1right|3
8) left|2x-1right|+54
9)left|dfrac{1}{3}-xright|-1dfrac{2}{3}
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tìm x biết
1)\(\left(1-2x\right)^2=9\)
2)\(\left(x+5\right)^3=-64\)
3)\(\left(3x-5\right)^2=16\)
4) \(\left(x-1\right)^3=27\)
5)\(x^2+x=0\)
6)\(5^{x+2}=625\)
7) \(5-\left|3x-1\right|=3\)
8) \(\left|2x-1\right|+5=4\)
9)\(\left|\dfrac{1}{3}-x\right|-1=\dfrac{2}{3}\)