-7/x+1=6/x+27 ét ô ét
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\(15-\dfrac{x}{2}=\dfrac{3}{7}\)
\(\dfrac{x}{2}=15-\dfrac{3}{7}=\dfrac{15\cdot7-3}{7}=\dfrac{102}{7}\)
\(x=\dfrac{102}{7}\cdot2=\dfrac{204}{7}\)
\(4,7\div0,25+5,3\times4\)
\(=18,8+21,2\)
\(=40\)
\(3\times\left(a-2\right)+150=240\)
\(3\times\left(a-2\right)=90\)
\(a-2=30\)
\(a=32\)
\(\dfrac{1}{9}+a+\dfrac{7}{12}=\dfrac{17}{18}\)
\(\dfrac{1}{9}+a=\dfrac{13}{36}\)
\(a=\dfrac{1}{4}\)
\(\left(\dfrac{1}{2}\times\dfrac{1}{3}+\dfrac{1}{3}\times\dfrac{1}{4}+\dfrac{1}{4}\times\dfrac{1}{5}+\dfrac{1}{5}\times\dfrac{1}{6}+\dfrac{1}{6}\times\dfrac{1}{7}+\dfrac{1}{7}\times\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+\dfrac{1}{4\times5}+\dfrac{1}{5\times6}+\dfrac{1}{6\times7}+\dfrac{1}{7\times8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\dfrac{3}{8}\times a=\dfrac{9}{16}\)
\(a=\dfrac{3}{2}\)
\(\left(3+5+7+...+2021\right)\times\left(6,2:0,25-2,48\times10\right)\)
\(=\left(3+5+7+...+2021\right)\times\left(24,8-24,8\right)\)
\(=\left(3+5+7+...+2021\right)\times0\)
\(=0\)
( 7 - \(x\))3 + (11 - 7)2 = 141
(7 - \(x\))3 + 42 = 141
( 7 - \(x\))3 + 16 = 141
(7 - \(x\))3 = 141 - 16
( 7 - \(x\))3 = 125
(7 - \(x\))3 = 53
7 - \(x\) = 5
\(x\) = 7 - 5
\(x\) = 2
\(\left(7-x\right)^3+\left(11-7\right)^2=141\)
\(\left(7-x\right)^3+4^2=141\)
\(\left(7-x\right)^3+16=141\)
\(\left(7-x\right)^3=141-16\)
\(\left(7-x\right)^3=125\)
\(\left(7-x\right)=5^3\)
\(\Rightarrow7-x=5\)
\(x=7-5\)
\(x=2\)
\(\text{Vậy x=2}\)
1) 42/35 - [ 33/14 . 21/22 - ( 54/25 : 27/25 - 7/10 )]
= 42/35 - ( 9/4-13/10)
=42/35-19/20
=1/4
2) a) 5/21 . x/34 = 35/102
x/34=35/102 : 5/21
x/34=49/34
=> x=34
Vậy x=34
b) 15/x . 21/13 = 45/91
15/x=45/91 : 21/13
15/x=15/49
=> x=49
Vậy x=49
\(1)\)\(x\div6=1234+980\)
\(x\div6=2214\)
\(x\) \(=2214\times6\)
\(x\) \(=13284\)
\(\dfrac{-7}{x+1}=\dfrac{6}{x+27}\)
\(\Rightarrow-7x-189=6x+6\)
\(\Rightarrow-7x-6x=6+189\)
\(\Rightarrow-13x=195\)
\(\Rightarrow x=-15\)
Vay x = -15
\(\dfrac{-7}{x+1}=\dfrac{6}{x+27}\)
\(\Rightarrow-7\left(x+27\right)=6\left(x+1\right)\)
\(\Rightarrow-7x-189=6x+6\)
\(\Rightarrow-7x-6x=6+189\)
\(\Rightarrow-13x=195\)
\(\Rightarrow x=-15\)
Vậy x=-15