mik đang cần gấp
a) X x 17,7 – 7,7 x X = 177
b) 9 x (12 – 2 x X) = 54
c) X x 3,9 + X x 0,1 = 16
d) 1,23 : X – 0,45 : X = 1,5
e) 17/5 : X = 34/5 : 4/3
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a)\(x\times17,7-7,7\times x=177\)
\(x\times\left(17,7-7,7\right)=177\)
\(x\times10=177\)
\(x=177\div10\)
\(x=17,7\)
b) \(9\times\left(12-2\times x\right)=54\)
\(12-2\times x=54\div9\)
\(12-2\times x=6\)
\(2\times x=12-6\)
\(2\times x=6\)
\(x=6\div2\)
\(x=3\)
c) \(x\times3,9+x\times0,1=16\)
\(x\times\left(3,9+0,1\right)=16\)
\(x\times4=16\)
\(x=16\div4\)
\(x=4\)
a) \(x\times17,7-7,7\times x=177\)
\(x\times\left(17,7-7,7\right)=177\)
\(x\times10=177\)
\(x=177:10\)
\(x=17,7\)
b) \(9\times\left(12-2\times x\right)=54\)
\(12-2\times x=54:9\)
\(12-2\times x=6\)
\(2\times x=12-6\)
\(2\times x=6\)
\(x=6:2\)
\(x=4\)
c) \(x\times3,9+x\times0,1=16\)
\(x\times\left(3,9+0,1\right)=16\)
\(x\times4=16\)
\(x=16:4\)
\(x=4\)
\(#Nulc`\)
a
x * 17,7 - 7,7 * x = 177
x*(17,7-7,7)=177
x*10=177
x=177:10=17,7
B) x * 3,9 + x : 10= 16
x*3,9+x*1/10=16
x*(3,9+1/10)=16
x*4=16
x=16:4=4
C) 1,23 : x - 0,45 : x =15
x*(1,23-0,45)=15
x*0,78=15
x*78/100=15
x=15:78/100=19,23076923...(các bạn tự tính)
Đ) (x - 1/3) * 5/3 = 14/27 - 3/9
(x-1/3)*5/3=5/27
x*1/3=5/27:5/3
x*1/3=1/9
x=1/9:1/3
x=1\3
G) ( 1,2 * 1,5 - x ) * 1/4 = 1,2 * 1,4
(1,2*1,5-x)*1/4=1,68
1,2*1,5-x=1,68:1/4
1,2*1,5-x=6,72
1,8-x=6,72
x=6,72-1,8
x=4,92
h) (84,6 - 2 * x ) : 3,02 = 5,1
(84,6-2 * x)=3,02*5,1
84,6-2*x=15,402
x=84,6-15,402
x*2=69,198
x=69,198:2=34,599
nhớ k cho mình nhá
a) x . 17,7 - 7,7 . x = 177
\(\Rightarrow\) x . ( 17,7 - 7,7 ) = 177
\(\Rightarrow\) x . 10 = 177
x = 177 : 10
x = 17,7
b) 9 . ( 12 - 2 . x ) = 54
\(\Rightarrow\) 9 . ( 10 . x ) = 54
10 . x = 54 : 9
10 . x = 6
x = 6 . 10
x = 60
\(x.17,7-7,7.x=177\)
\(\Rightarrow x.\left(17,7-7,7\right)=177\)
\(\Rightarrow x.10=177\)
\(\Rightarrow x=177:10=17,7\)
a)9.x + 1=73
9x=73-1
9x=72
x=72:9
x=8
b)2.x - 5 = -17 - 12
2x-5=-29
2x=-29+5
2x=-24
x=-24:2
x=-12
c)10 - x - 5 = - 5 - 7 -11
10-x-5=-12-11
10-x-5=-23
10-x=-23+5
10-x=18
x=10-18
x=-8
d)(-9) . x + 3 = (-2) . (-7) +16
-9x+3=14+16
-9x+3=30
-9x=30-3
-9x=27
x=27:(-9)
x=-3
(-12) . x - 34 =2
-12x=2+34
-12x=36
x=36:(-12)
x=-3
(-11).x + 9 =130
-11x=130-9
-11x=121
x=121:(-11)
x=11
(-5) .x + 5 = (-15) .(-4) -12
-5x+5=60-12
-5x+5=48
-5x=48-5
-5x=43
x=43:(-5)
x=-8,6
IxI -3=0
|x|=3
=>x=+3
(7 - IxI).(2.x - 4) =0
*7-|x|=0 * 2x-4=0
|x|=7 2x=4
=>x=+7 x=4:2
x=2
280-(x-140):35 =270
(x-140):35=280-270
(x-140):35=10
x-140=10.35
x-140=350
x=350+140
x=490
(1900 - 2.x ) : 35- 32 =16
1900-2x=(16+32).35
1900-2x=1680
2x=1900-1680
2x=220
x=220:2
x=110
720 :[41-(2x -5 )] =23 .5
720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=23+5
2x=28
x=28:2
x=14
(x - 5).(x2 - 4 ) =0
* x-5=0 * x2-4=0
x=0+5 x2=4
x=5 x2=22
=> x=+2
\(a.\dfrac{3}{2}+\dfrac{-1}{3}< \dfrac{x}{6}< \dfrac{1}{9}+\dfrac{31}{18}\)
\(\Leftrightarrow\dfrac{7}{6}< \dfrac{x}{6}< \dfrac{11}{6}\)
\(\Leftrightarrow7< x< 11\)
\(\Leftrightarrow x\in\left\{8;9;10\right\}\)
\(b.\dfrac{-5}{12}+\dfrac{7}{12}+\dfrac{-1}{12}< \dfrac{x}{12}< \dfrac{2}{15}+\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{1}{12}< \dfrac{x}{12}< \dfrac{1}{3}\)
\(\Leftrightarrow\dfrac{1}{12}< \dfrac{x}{12}< \dfrac{4}{12}\)
\(\Leftrightarrow1< x< 4\)
\(\Leftrightarrow x\in\left\{2;3\right\}\)
A. x = 2
B. \(\dfrac{3}{8}=\dfrac{6}{x}\)\(\Leftrightarrow x=\dfrac{6.8}{3}=16\)
C. x = 3
D. \(x=\dfrac{4.6}{8}=3\)
E. \(x=\dfrac{7}{3}\)
G.\(\dfrac{14}{13}=\dfrac{28}{10-x}\)
<=>\(14\left(10-x\right)=364\)
<=> 10 - x = 26
<=> x = -16
H. \(3\left(x+2\right)=4\left(x-5\right)\)
<=> 3x + 6 = 4x - 20
<=> -x = -26
<=> x = 26
K. \(\dfrac{x}{2}=\dfrac{8}{x}\)
<=> \(x^2=16\)
<=> \(\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)
M. \(\left(x-2\right)^2=100\)
<=> \(\left[{}\begin{matrix}x-2=10\\x-2=-10\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-8\end{matrix}\right.\)
a=2
b=16
c=3
d=3
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