198 - 42 : 6 x X + 16 = 130
Tìm X nhé :3
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198 - 42 : 6 . x + 16 = 200
=> 214 - 7x = 200
=> 7x = 214 - 200
=> 7x = 14
=> x = 14 : 7
=> x = 2
\(198-42:6\times x+16=200\)
\(198-7\times x=200-16\)
\(198-7\times x=184\)
\(7\times x=198-184\)
\(7\times x=14\)
\(x=14:7\)
\(x=2\)
Hok tốt
198+ 42 : 6 x Y = 200
198 + 7 x y = 200
198 + y = 200 x 7
198 + y = 1400
y = 1400 -
198+ 42 : 6 x Y = 200
198 + 7 x y = 200
198 + y = 200 x 7
198 + y = 1400
y = 1400 - 198
y = 1202
42-2(x+16) +12 :2=6(x-1)+ (-4)^3 :16
42- 2x- 32 +6 = 6x - 6 - 64: 16
(42 - 32 +6) - 2x = 6x - 6 - 4
16 = 2x = 6x- 10
16+10= 2x+6x
26= 8x
x= 26/8
x= 13/4
2: Tìm x
a) Ta có: x+25=40
nên x=40-25=15
Vậy: x=15
b) Ta có: 198-(x+4)=120
\(\Leftrightarrow x+4=198-120=78\)
hay x=78-4=74
Vậy: x=74
c) Ta có: \(\left(2x-7\right)\cdot3=125\)
\(\Leftrightarrow2x-7=\dfrac{125}{3}\)
\(\Leftrightarrow2x=\dfrac{125}{3}+7=\dfrac{125}{3}+\dfrac{21}{3}=\dfrac{146}{3}\)
\(\Leftrightarrow x=\dfrac{146}{3}:2=\dfrac{146}{6}=\dfrac{73}{3}\)
Vậy: \(x=\dfrac{73}{3}\)
d) Ta có: \(x+16⋮x+1\)
\(\Leftrightarrow x+1+15⋮x+1\)
mà \(x+1⋮x+1\)
nên \(15⋮x+1\)
\(\Leftrightarrow x+1\inƯ\left(15\right)\)
\(\Leftrightarrow x+1\in\left\{1;-1;3;-3;5;-5;15;-15\right\}\)
hay \(x\in\left\{0;-2;2;-4;4;-6;14;-16\right\}\)
Vậy: \(x\in\left\{0;-2;2;-4;4;-6;14;-16\right\}\)
\(a,x+25=40\\ \Rightarrow x=40-25\\ \Rightarrow x=15\\ b,198-\left(x+4\right)=120\\ \Rightarrow-\left(x+4\right)=120-198\\ \Rightarrow-\left(x+4\right)=-78\\ \Rightarrow x+4=78\\ \Rightarrow x=78-4\\ \Rightarrow x=74\\ c,\left(2x-7\right).3=125\\ \Rightarrow2x-7=\dfrac{125}{3}\\ \Rightarrow2x=\dfrac{125}{3}+7\\ \Rightarrow2x=\dfrac{146}{3}\\ \Rightarrow x=\dfrac{146}{3}:2\Rightarrow x=\dfrac{73}{3}\\ d,\left(x+16\right)⋮\left(x+1\right)\\ \Rightarrow\left[\left(x+1\right)+15\right]⋮\left(x+1\right)\\ mà:\left(x+1\right)⋮\left(x+1\right)\\ \Rightarrow15⋮\left(x+1\right)\\ \Rightarrow\left(x+1\right)\inƯ\left(15\right)\\ \Rightarrow\left(x+1\right)\in\left\{-15;-1;1;15\right\}\\ \Rightarrow x\in\left\{-16;-2;0;14\right\}\)
Tự kết luận nhé bạn
1/ `|x|=10<=> x=\pm 10`
2/ `|x-8|=0<=>x-8=0<=>x=8`
3/ `7+|x|=12<=>|x|=5<=>x=\pm 5`
4/ `|x+1|=3`
$\Leftrightarrow\left[\begin{array}{1}x+1=3\\x+1=-3\end{array}\right.\\\Leftrightarrow\left[\begin{array}{1}x=3\\x=-4\end{array}\right.$
5/ `15-x=16-(14-42)`
`<=>15-x=16+28`
`<=>15-x=44`
`<=>x=-29`
6/ `210-(x-12)=168`
`<=>210-x+12=168`
`<=>222-x=168`
`<=>x=54`
198 - 42 : 6 . x + 16 = 130
=> 214 - 7.x = 130
=> 7.x = 214 - 130
=> 7.x = 84
=> x = 84 : 7
=> x = 12
(. là nhân)
#)Giải :
198 - 42 : 6 x X + 16 = 130
198 - 7 x X + 16 = 130
198 - 7 x X = 130 - 16
198 - 7 x X = 114
7 x X = 198 - 114
7 x X = 84
X = 84 : 7
X = 12
#~Will~be~Pens~#