tìm x biết:
\(\left[\frac{45\frac{10}{63}-44\frac{25}{84}}{\left(2\frac{1}{3}-1\frac{1}{9}\right):4-\frac{3}{4}}:31\right].x=-\frac{1}{16}\)
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Tìm x, biết : \(\left[\frac{45\frac{10}{63}-44\frac{25}{84}}{\left(2\frac{1}{3}-1\frac{1}{9}\right):4-\frac{3}{4}}:31\right].x=-\frac{1}{16}\)
tìm x biết:
\(\left(\frac{45\frac{10}{63}-44\frac{25}{84}}{\left(2\frac{1}{3}-1\frac{1}{9}\right):4-\frac{3}{4}}:31\right).x=\frac{-1}{16}\)
\(\left[\frac{45\frac{10}{63}-44\frac{25}{84}}{\left(2\frac{1}{3}-1\frac{1}{9}\right):4-\frac{3}{4}}:31\right]x=\frac{-1}{16}\)
\(\Rightarrow\left(\frac{\frac{31}{36}}{\frac{11}{9}:4-\frac{3}{4}}:31\right).x=\frac{-1}{16}\Rightarrow\left(\frac{\frac{31}{36}}{\frac{-4}{9}}:31\right)x=-\frac{1}{16}\Rightarrow\left(-\frac{31}{16}:31\right)x=-\frac{1}{16}\Rightarrow-\frac{1}{16}x=-\frac{1}{16}\Rightarrow x=1\)
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Tìm x biết :a) left[left(6frac{3}{5}-3frac{3}{14}right).2,5right]:left(21-1,25right)x:5frac{5}{6}b) left(4-frac{3}{4}right):left(2frac{1}{3}-1frac{1}{9}right)31x:left(45frac{10}{63}-44frac{25}{84}right)c) frac{x-1}{x+5}frac{6}{7}d) frac{x^2}{6}frac{24}{25}e) frac{x-2}{x-1}frac{x+4}{x+7}giúp mình nhé
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Tìm x biết :
a) \(\left[\left(6\frac{3}{5}-3\frac{3}{14}\right).2,5\right]:\left(21-1,25\right)=x:5\frac{5}{6}\)
b) \(\left(4-\frac{3}{4}\right):\left(2\frac{1}{3}-1\frac{1}{9}\right)=31x:\left(45\frac{10}{63}-44\frac{25}{84}\right)\)
c) \(\frac{x-1}{x+5}=\frac{6}{7}\)
d) \(\frac{x^2}{6}=\frac{24}{25}\)
e) \(\frac{x-2}{x-1}=\frac{x+4}{x+7}\)
giúp mình nhé 
e)
=> (x-2) . (x+7) = ( x-1 ) . ( x +4)
=> x2 +7x - 2x -14 = x2 - x + 4x - 4
x2 + 5x - 14 = x2 + 3x - 4
=> 5x - 14 = 3x - 4
=> 5x - 3x = 14-4
=> 2x = 10 => x = 10 : 2 => x = 5
c)
=>( x-1) . 7 = ( x + 5 ) . 6
=> 7x - 7 = 6x + 30
=> 7x - 6x= 30 + 7
=> x = 37
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a,x=\(\frac{5}{2}\)
b,x=\(\frac{13}{176}\)
c,x=37
d, x=\(\frac{12}{5}\)
e, x=5
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a)left(152frac{2}{4}-148frac{3}{8}right):0,2x:0,3b)left(85frac{7}{30}-83frac{5}{18}right):2frac{2}{3}0,01x:4c)left[left(6frac{3}{5}-3frac{3}{14}right).2,5right]:left(21-1,25right)x:5frac{5}{6}d)left(4-frac{3}{4}right):left(2frac{1}{3}-1frac{1}{9}right)31x:left(45frac{10}{63}-44frac{25}{84}right)Giúp mình vs mình đang cần gấp
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a)\(\left(152\frac{2}{4}-148\frac{3}{8}\right):0,2=x:0,3\)b)\(\left(85\frac{7}{30}-83\frac{5}{18}\right):2\frac{2}{3}=0,01x:4\)c)\(\left[\left(6\frac{3}{5}-3\frac{3}{14}\right).2,5\right]:\left(21-1,25\right)=x:5\frac{5}{6}\)d)\(\left(4-\frac{3}{4}\right):\left(2\frac{1}{3}-1\frac{1}{9}\right)=31x:\left(45\frac{10}{63}-44\frac{25}{84}\right)\)
Giúp mình vs mình đang cần gấp
Tìm x \(\in\) Z biết:
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) \(4\frac{5}{9}:2\frac{5}{18}-7< x< \left(3\frac{1}{5}:3,2+4,5.1\frac{31}{45}\right):\left(-21\frac{2}{3}\right)\)
a) \(\frac{1}{2}-\left(\frac{1}{3}+\frac{1}{4}\right)< x< \frac{1}{48}-\left(\frac{1}{16}-\frac{1}{6}\right)\)
Ta có: 1/2 - (1/3 + 1/4) = 1/2 - 7/12 = -1/12 ;
1/48 - (1/16 - 1/6) = 1/48 + 5/48 = 1/8
Vì \(-\frac{1}{12}< x< \frac{1}{8}\) nên x = 0
b) \(4\frac{5}{9}:2\frac{5}{18}-7< x< \left(3\frac{1}{5}:3,2+4,5.1\frac{31}{45}\right):\left(-21\frac{2}{3}\right)\)Ta có :
\(4\frac{5}{9}:2\frac{5}{18}-7=2-7=-5\)
\(\left(3\frac{1}{5}:3,2+4,5.1\frac{31}{45}\right):\left(-21\frac{2}{3}\right)=\left(1+\frac{38}{5}\right):\left(-21\frac{2}{3}\right)=\frac{43}{5}:\frac{-65}{3}=-\frac{129}{325}\)
Vì \(-5< x< -\frac{129}{325}\) nên \(x\in\left\{-4;-3;-2;-1\right\}\)
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Mấy bn ơi, giúp mk vs
Tìm x, biết:
\(x-0,27=\frac{\frac{73}{77}+\frac{73}{165}+\frac{73}{285}}{25\times\left(\frac{5}{84}+\frac{3}{180}+\frac{4}{285}\right)}\)
Tính P;
\(P=\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right)\times230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{7}+\frac{10}{3}\right)\div\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
Ai đúng mk tích, cảm ơn các bn
Tìm x :
x - 0,27 = \(\frac{73}{100}\)
x = \(\frac{73}{100}+0,27\)
x = 1
Cậu P khó quá mik chưa nghĩ ra cách tính nhanh nhất !
Cậu tự giải nhé !
Hok tốt
\(x-0,27=\frac{\frac{73}{77}+\frac{73}{165}+\frac{73}{285}}{25\times\left(\frac{5}{84}+\frac{3}{180}+\frac{4}{285}\right)}.\)
\(x-0,27=\frac{\frac{146}{105}+\frac{73}{285}}{25\times\left(\frac{8}{105}+\frac{4}{285}\right)}\)
\(x-0,27=\frac{\frac{219}{133}}{25\times\frac{12}{133}}\)
\(x-0,27=\frac{\frac{219}{133}}{\frac{300}{133}}\)
\(x-0,27=0,73\)
\(x=0,73+0,27\)
\(x=1\)
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1. Tìm x, biết:
a) 3,2.x + (-1,2).x + 2,7 = -4,9
b) -5,6.x + 2,9.x - 3,86 = -9,8
2. Tính giá trị của các biểu thức :
A = -5,13 : \(\left(5\frac{5}{28}-1\frac{8}{9}.1,25+1\frac{16}{63}\right)\)
B = \(\left(3\frac{1}{3}.1,9+19,5:4\frac{1}{3}\right).\left(\frac{62}{75}-\frac{4}{25}\right)\)
Bài 1:
a) Ta có:
\(3,2\cdot x+\left(-1,2\right)\cdot x+2,7=-4,9\)
\(\Rightarrow\left[3,2+\left(-1,2\right)\right]\cdot x=\left(-4,9\right)-2,7\)
\(\Rightarrow2x=-7,6\)
\(\Rightarrow x=\left(-7,6\right):2\)
\(\Rightarrow x=-3,8\)
Vậy \(x=-3,8\)
b) Ta có:
-5,6.x+2,9.x-3,86=-9,8
=>[(-5,6)+2,9].x=(-9,8)+3,86
=>(-2,7).x=-5,94
=>x=(-5,94):(-2,7)
=>x=2,3
Vậy x=2,2
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tính giá trị biểu thức a) left|111-324right|+left|-2-415right|+left|354-123right|b) left|-2^3+5^2-35right|-left|3^4-2^5-12^2right|c) 1frac{13}{15}.0,75-left(frac{104}{195}+25%right).frac{24}{47}-3frac{12}{13}:3 d) left(2frac{1}{3}-1frac{1}{9}right):4-frac{3}{4}e)6-frac{left(2,3+5:6,25right).7}{8.0,0125+6,9}g)45frac{10}{63}-44frac{25}{84}
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tính giá trị biểu thức
a) \(\left|111-324\right|+\left|-2-415\right|+\left|354-123\right|\)
b) \(\left|-2^3+5^2-35\right|-\left|3^4-2^5-12^2\right|\)
c) \(1\frac{13}{15}.0,75-\left(\frac{104}{195}+25\%\right).\frac{24}{47}-3\frac{12}{13}:3\)
d) \(\left(2\frac{1}{3}-1\frac{1}{9}\right):4-\frac{3}{4}\)
e)\(6-\frac{\left(2,3+5:6,25\right).7}{8.0,0125+6,9}\)
g)\(45\frac{10}{63}-44\frac{25}{84}\)