Ôn tập toán 6
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tim x
\(a,\left|\frac{4}{7}-x\right|+\frac{2}{5}=0\)
\(b,6-\left|\frac{1}{4}x+\frac{2}{5}\right|=0\)
\(c,\left|x-\frac{1}{3}\right|+\left|2-\frac{4}{5}\right|=0\)
+Tim x : a ) left(x-frac{1}{2}right)^3frac{1}{27} b )left(x+frac{1}{2}right)^2frac{4}{25}c ) left(x+1right)^{x+2}left(x-1right)^{x+6} (x ϵ Z )d ) left(2x+3right)^{2016}left(2x+3right)^{2018}e ) frac{3}{x+2.x+5}+frac{5}{x+5.x+10}+frac{7}{x+10.x+17}frac{x}{x+2.x+17} Với xnotinleft{-2;-5;-10;-17right}
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+Tim x :
a ) \(\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\)
b )\(\left(x+\frac{1}{2}\right)^2=\frac{4}{25}\)
c ) \(\left(x+1\right)^{x+2}=\left(x-1\right)^{x+6}\) (x ϵ Z )
d ) \(\left(2x+3\right)^{2016}=\left(2x+3\right)^{2018}\)
e ) \(\frac{3}{x+2.x+5}+\frac{5}{x+5.x+10}+\frac{7}{x+10.x+17}=\frac{x}{x+2.x+17}\) Với \(x\notin\left\{-2;-5;-10;-17\right\}\)
Tính nhanh
a) \(\frac{6}{7}:\left(\frac{1}{2}\text{X}\frac{3}{4}\right)-\frac{5}{8}\)
b) 34-2:\(\left(\frac{3}{5}-\frac{1}{2}\right)\)
c) \(\left(4\frac{1}{2}+\frac{1}{2}:5\frac{1}{2}\right)\text{X}\left(3\frac{5}{6}+2\frac{1}{6}\text{x}6\right)\)
tìm x biết :a) left(x+frac{1}{2}right).left(frac{2}{3}-2xright)0b) left(x.6frac{2}{7}+frac{3}{7}right).2frac{1}{5}-frac{3}{7}-2c) x.3frac{1}{4}+left(-frac{7}{6}right).x-1frac{2}{3}frac{5}{12}d) 5frac{8}{17}:x+left(-frac{4}{17}right):x+3frac{1}{7}:17frac{1}{3}frac{4}{11}e) frac{17}{2}-left|2x-frac{3}{4}right|-frac{7}{4}
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tìm x biết :
a) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
tìm x biết :
a) \(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
b) \(-1\frac{5}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
c) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
tìm số x , biết :a) frac{2}{3}x-frac{3}{2}xfrac{5}{12}b) frac{2}{5}+frac{3}{5}.left(3x-3,7right)frac{-53}{10}c) frac{7}{9}:left(2+frac{3}{4}xright)+frac{5}{9}frac{23}{27}d) frac{-2}{3}.x+frac{1}{5}frac{3}{10}e) left|xright|-frac{3}{4}frac{5}{3}f) left|2x-frac{1}{3}right|+frac{5}{6}1
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tìm số x , biết :
a) \(\frac{2}{3}x-\frac{3}{2}x=\frac{5}{12}\)
b) \(\frac{2}{5}+\frac{3}{5}.\left(3x-3,7\right)=\frac{-53}{10}\)
c) \(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)
d) \(\frac{-2}{3}.x+\frac{1}{5}=\frac{3}{10}\)
e) \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)
f) \(\left|2x-\frac{1}{3}\right|+\frac{5}{6}=1\)
Tìm x biết : \(2\frac{1}{4}x-9\frac{1}{4}=-7\frac{1}{4}\)Tìm x biết: \(1-\left(6\frac{3}{8}+x-7\frac{5}{24}\right).16\frac{2}{3}=26\)
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Tính giá trị biểu thức
\(A=\left(27,54.\frac{11}{16}-3,405\right):3\)
\(B=\left(\frac{1}{6}+0,1+\frac{1}{5}\right):\left(\frac{1}{6}+0,1-\frac{1}{5}\right)\)
\(C=\left(0,5-\frac{1}{3}+0,25\right):\left(0,25-\frac{1}{6}\right)\)
\(D=\frac{13,5.1420+4,5.780.3}{3+6+9+...+24+27}\)
Bài 1 Tìm Max
a) A = \(\frac{21\left|4x+6\right|+33}{3\left|4x+6\right|+5}\)
b) B = \(\frac{15\left|x+1\right|+32}{6\left|x+1\right|+8}\)
c) C = \(\frac{6\left|y+5\right|+14}{2\left|y+5\right|+14}\)