Ôn tập toán 7
Các câu hỏi tương tự
Tìm x : \(\frac{\left(x-3\right)^2}{2}-1\frac{1}{3}\left(x+2\right)^2-\frac{5}{4}\left(x-1\right)\left(x+1\right)=1\frac{1}{2}x\left(x-2\right)-x-4\)
Tìm x: \(\frac{\left(x-2\right)^2}{2}-4\frac{1}{3}\left(x+3\right)^2=\frac{1}{4}\left(x-1\right)\left(x-2\right)-2\left(3x-1\right)\left(2+3x\right)\)
Tìm x: \(\left|x-5\right|+\frac{\left(x-1\right)\left(x-3\right)}{2}=\frac{\left(x+1\right)^2}{3}-\frac{\left(1-2x\right)^2}{4}\)
Tìm x in Za,frac{1}{2}-left(frac{1}{3}+frac{1}{4}right) x frac{1}{48}-left(frac{1}{16}-frac{1}{6}right)b, frac{3}{4}-frac{5}{6}lefrac{x}{12} 1-left(frac{2}{3}-frac{1}{3}right)c, x:left(frac{1}{2}right)^2frac{-1}{2}d,left(x^4right)^2frac{x^{12}}{x^5}left(xne0right)e,frac{3^2.3^8}{27^3}3^xf,2^{x-1}left(16right)^5
Đọc tiếp
Tìm x \(\in\) Z
a,\(\frac{1}{2}-\left(\frac{1}{3}+\frac{1}{4}\right)< x< \frac{1}{48}-\left(\frac{1}{16}-\frac{1}{6}\right)\)
b, \(\frac{3}{4}-\frac{5}{6}\le\frac{x}{12}< 1-\left(\frac{2}{3}-\frac{1}{3}\right)\)
c, \(x:\left(\frac{1}{2}\right)^2=\frac{-1}{2}\)
d,\(\left(x^4\right)^2=\frac{x^{12}}{x^5}\left(x\ne0\right)\)
e,\(\frac{3^2.3^8}{27^3}=3^x\)
f,\(2^{x-1}=\left(16\right)^5\)
1. Tìm x ϵ Q sao cho:a) (2x-3). (x+1) 0.b) left(x-frac{1}{2}right).left(x+3right) 0.2. Tính:Sfrac{1}{3.5}+frac{1}{5.7}+...+frac{1}{999.1001}3. Tìm x: Biết x không thuộc{-2; -5; -10; -17}frac{3}{left(x+2right).left(x+5right)}+frac{5}{left(x+5right).left(x+10right)}+frac{7}{left(x+10right).left(x+17right)}frac{x}{left(x+2right).left(x+17right)}
Đọc tiếp
1. Tìm x ϵ Q sao cho:
a) (2x-3). (x+1) < 0.
b) \(\left(x-\frac{1}{2}\right).\left(x+3\right)\)> 0.
2. Tính:
S=\(\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{999.1001}\)
3. Tìm x: Biết x không thuộc{-2; -5; -10; -17}
\(\frac{3}{\left(x+2\right).\left(x+5\right)}+\frac{5}{\left(x+5\right).\left(x+10\right)}+\frac{7}{\left(x+10\right).\left(x+17\right)}=\frac{x}{\left(x+2\right).\left(x+17\right)}\)
Tìm x: \(3\left(x-2\right)^2-1\frac{1}{4}\left(1+3x\right)^2=1\frac{1}{3}\left(x-1\right)\left(3-x\right)-1\frac{1}{6}x\left(x-3\right)\)
Giúp mk vs đg cần gấp nha cảm ơn mấy bạn nhiều lắm !!!left(frac{1}{2}right)^5.xleft(frac{1}{2}right)^7left(frac{3}{7}right)^2.xleft(frac{9}{21}right)^2Bài tìm x biết :2x23x347x77(-3)x(-3)5(-5)x(-5)42x42x82x163x+1325x-156x+461052x-7511(-2)4x+264left(frac{1}{2}right)^xleft(frac{1}{2}right)^5left(frac{5}{6}right)^{2x}left(frac{5}{6}right)^5left(frac{3}{4}right)^{2x-1}left(frac{3}{4}right)^{5x-4}left(-frac{1}{10}right)^xfrac{1}{100}left(-frac{3}{2}right)^xfrac{9}{4}left(-frac{3}{5}right)^{2x}frac{9}...
Đọc tiếp
Giúp mk vs đg cần gấp nha cảm ơn mấy bạn nhiều lắm !!!
\(\left(\frac{1}{2}\right)^5.x=\left(\frac{1}{2}\right)^7\)
\(\left(\frac{3}{7}\right)^2.x=\left(\frac{9}{21}\right)^2\)
Bài tìm x biết :
2x=2
3x=34
7x=77
(-3)x=(-3)5
(-5)x=(-5)4
2x=4
2x=8
2x=16
3x+1=32
5x-1=5
6x+4=610
52x-7=511
(-2)4x+2=64
\(\left(\frac{1}{2}\right)^x=\left(\frac{1}{2}\right)^5\)
\(\left(\frac{5}{6}\right)^{2x}=\left(\frac{5}{6}\right)^5\)
\(\left(\frac{3}{4}\right)^{2x-1}=\left(\frac{3}{4}\right)^{5x-4}\)
\(\left(-\frac{1}{10}\right)^x=\frac{1}{100}\)
\(\left(-\frac{3}{2}\right)^x=\frac{9}{4}\)
\(\left(-\frac{3}{5}\right)^{2x}=\frac{9}{25}\)
\(\left(-\frac{2}{3}\right)^x=-\frac{8}{27}\)
tìm x biết:a) left|x+0,573right|2b)left|x+frac{1}{3}right|-4left(-1right)c)1,5.left|3x-1right|+4,6599,103d) left[frac{left(x-4frac{1}{2}right):0,003}{left(3frac{1}{20}-2,65right).4:frac{1}{5}}-frac{left(0,3-frac{3}{20}right).1frac{1}{2}}{left(1,88+2frac{3}{25}right):frac{1}{8}}right]:62frac{1}{20}+17,81:0,0131-13010
Đọc tiếp
tìm x biết:
a) \(\left|x+0,573\right|=2\)
b)\(\left|x+\frac{1}{3}\right|-4=\left(-1\right)\)
c)\(1,5.\left|3x-1\right|+4,659=9,103\)
d) \(\left[\frac{\left(x-4\frac{1}{2}\right):0,003}{\left(3\frac{1}{20}-2,65\right).4:\frac{1}{5}}-\frac{\left(0,3-\frac{3}{20}\right).1\frac{1}{2}}{\left(1,88+2\frac{3}{25}\right):\frac{1}{8}}\right]:62\frac{1}{20}+17,81:0,0131-1301=0\)
Tìm x: \(\frac{\left(2-3x\right)^2}{3}-\frac{\left(1+2x\right)^2}{2}=\frac{3}{4}-2\left(x-1\right)\left(x+2\right)+x\left(1+x\right)\)