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\(a.x+\left(x+10\right)+\left(x+14\right)+....+\left(x+162\right)=3434\\ x+\left(x+x+.....+x\right)+\left(10+14+18+.....+162\right)=3434\\ x+x+39+3354=3434\\ x\cdot40=80\\ x=2\)
`5(x+2) -2x=18`
`=> 5x+10 -2x=18`
`=> 3x+10=18`
`=>3x=18-10`
`=>3x=8`
`=>x=8/3`
=>5x+10-2x=18
=>3x+10=18
=>3x=18-10=8
=>x=\(\dfrac{8}{3}\)
( 3x - 6 ) . 3 = 18
3x - 6 = 18 : 3 = 6
3x = 6 + 6 = 12
x= 4
6x - 5 = 613
6x = 613 + 5 =618
x=103
x-36:18=12
x - 2 = 12
x= 12 + 2
x= 14
\(\left(3x-6\right).3=18\)
\(\Rightarrow3x-6=19:3=6\)
\(\Rightarrow3x=6+6=12\)
\(\Rightarrow x=12:3=4\)
\(6.x-5=613\)
\(\Rightarrow6x=613+ 5=618\)
\(\Rightarrow x=618:6=103\)
\(x-36:18=12\)
\(\Rightarrow x-2=12\)
\(\Rightarrow x=12+2=14\)
Ủng hộ nha m.n ^_^
a.X x 5 + X x4 = 36
X (5+4) = 36
X = 4
b. X x 4 - X x3 = 18
X (4-3) = 18
X = 18
X :0,2 + x X 4=36
X :2/10+x x 4=36
x x10/2+x x 4 =36
x x5 + x x4 =36
x x (4+5)=36
x x 9 =36
x=36:9
x=4
x :0.25 - x x 3 =18
x:25/100- x x 3=18
x x100/25- x x 3=18
x x 4- x x 3 =18
x x(4-3)=18
x x 1=18
x=18:1
x=18
\(2x^2\cdot3^y=18\)
\(\Leftrightarrow2x^2\cdot3^y=2\cdot3^2\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\in\left\{1;-1\right\}\\y=2\end{matrix}\right.\)
a/\(\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{25}{28}\)
\(=1\times\dfrac{25}{28}\)
\(=\dfrac{25}{28}\)
b/\(\dfrac{4}{7}\times\dfrac{17}{18}\times\dfrac{7}{4}\times\dfrac{18}{17}\)
\(=\left(\dfrac{4}{7}\times\dfrac{7}{4}\right)\times\left(\dfrac{17}{18}\times\dfrac{18}{17}\right)\)
\(=1\times1\)
\(=1\)
a) \(128+x\times24=4400\)
\(x\times24=4400-128\)
\(x\times24=4272\)
\(x=4272:24\)
\(x=178\)
b) \(125\times\left(x-18\right)=8875\)
\(x-18=8875:125\)
\(x-18=71\)
\(x=71+18\)
\(x=89\)
42 - x = 105 : 15 + 18
42 - x = 7 + 18 = 25
x = 42 - 25 = 17
( x - 22 x 10 ) : 11 = 39
x - 220 = 39 x 11 = 429
x = 429 + 220 = 649
42 - x = 7 + 18
<=> 42 - x = 25
<=> x= 17
( x - 220) : 11 = 39
x - 220 = 429
x = 209
X=6
K NHA