46-(x-11)=-48
46-(x-11) = -48
46 - (x - 11) = -48
x - 11 = 46 + 48
x - 11 = 94
x = 94 + 11
x = 105
Chúc bạn học tốt ^^
<=> 46-x+11=-48
<=>-x=-48-11-46
<=>-x=-105
<=>x=105
46-(x-11)=-48
(x-11)=46-(-48)
(x-11)=94
x-11=94
x=94+11
x=105
CHÚC BẠN HỌC TỐT
mn giúp e vs ạ!!
tìm x:
46-(x-11)=-48.
<=> 46-x+11=-48
<=> x= 46+11+48
<=>x= 105
Vậy x=105
Chúc bạn học tốt nha!
TL:
46 - (x - 11) = - 48
=> 46 - x + 11 = - 48
=> x = 46 + 11 + 48
=> x = 105
Vậy x = 105
HT~
Tính bằng cách thuận tiện:
a) ( 45 x 46 + 47 x 48) x (45 x 128 - 90 x 64)
=
b) 1988 x 1996 + 1997 x 11 + 1985
=
Tìm x biết:
(x-2).(x+4)=0
2x2 - 3 = 29
46 - (x-11)= -48
a) (x-2).(x+4)=0
<=> hoặc x-2=0 hoặc x+4=0
<=> hoặc x=2 hoặc x=-4
Vậy x \(\in\){-4;2}
b) 2x2-3=29
=> 2x2=32
=> x2=16
<=> x=4
c) 45-(x-11)=-48
x-11 = 45-(-48)
x-11 = 45+48
x-11 = 93
x = 93+11
x = 104
1) (x-2).(x+4)=0
2) (x-2).(x+15)=0
3) (7-x).(x+19)=0
4) -5<x<1
5) (x-3)(x-5)<0
6) 2x2-3=29
7) -6x-(-7)=25
8) 46-(x-11) = -48
1) \(\left(x-2\right)\left(x+4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-2=0\\x+4=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-4\end{matrix}\right.\)
2) \(\left(x-2\right)\left(x+15\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-2=0\\x+15=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-15\end{matrix}\right.\)
3) \(\left(7-x\right)\left(x+19\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}7-x=0\\x+19=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-19\end{matrix}\right.\)
4) \(-5< x< 1\)
\(\Rightarrow x\in\left\{-1;-3;-2;-1;0\right\}\)
5) \(\left(x-3\right)\left(x-5\right)< 0\)
\(\Rightarrow\left[{}\begin{matrix}x-3>0\\x-5< 0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x>3\\x< 5\end{matrix}\right.\)
\(\Rightarrow3< x< 5\)
6) \(2x^2-3=29\)
\(\Rightarrow2x^2=29+3\)
\(\Rightarrow2x^2=32\)
\(\Rightarrow x^2=\dfrac{32}{2}\)
\(\Rightarrow x^2=16\)
\(\Rightarrow x^2=4^2\)
\(\Rightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)
7) \(-6x-\left(-7\right)=25\)
\(\Rightarrow-6x+7=25\)
\(\Rightarrow-6x=25-7\)
\(\Rightarrow-6x=18\)
\(\Rightarrow x=\dfrac{18}{-6}\)
\(\Rightarrow x=-3\)
8) \(46-\left(x-11\right)=-48\)
\(\Rightarrow x-11=48+46\)
\(\Rightarrow x-11=94\)
\(\Rightarrow x=94+11\)
\(\Rightarrow x=105\)
1: (x-2)(x+4)=0
=>x-2=0 hoặc x+4=0
=>x=2 hoặc x=-4
2: (x-2)(x+15)=0
=>x-2=0 hoặc x+15=0
=>x=2 hoặc x=-15
3: (7-x)(x+19)=0
=>7-x=0 hoặc x+19=0
=>x=7 hoặc x=-19
4: -5<x<1
=>\(x\in\left\{-4;-3;-2;-1;0\right\}\)
5: (x-3)(x-5)<0
=>x-3>0 và x-5<0
=>3<x<5
6: 2x^2-3=29
=>2x^2=32
=>x^2=16
=>x=4 hoặc x=-4
7: -6x-(-7)=25
=>-6x=25-7=18
=>x=-3
8: 46-(x-11)=-48
=>x-11=46+48=94
=>x=94+11=105
tìm xϵz , biết :
a) 2x^2 - 3 = 29
b) -6x - (-7) = 25
c) 46 - (x - 11 ) = -48
a/\(2\cdot x^2-3=29\)
\(2\cdot x^2=29+3=32\)
\(x^2=\frac{32}{2}=16\)
=> \(x=\sqrt{16}=4\)
b/\(\left(-6\right)x-\left(-7\right)=25\)
\(\left(-6\right)x+7=25\)
\(\left(-6\right)x=25-7=18\)
\(x=\frac{18}{-6}=-3\)
c/ \(46-\left(x-11\right)=-48\)
\(46-x+11=-48\)
\(x=46-\left[\left(-48\right)-11\right]=105\)
a) 2x^2 -3= 29
2x^2 = 32
x^2 = 16
x = +4 ; -4
b) -6x - (-7) =25
-6x +7 =25
-6x = 18
x = -3
c) 46 - (x-11) = -48
46 -x +11 = -48
46 -x = -59
x = 105
a/\(2x^2-3=29\)
\(2x^2=29+3=32\)
\(x^2=\frac{32}{2}=16\)
\(x=\sqrt{16}=4\)
b/\(\left(-6\right)x-\left(-7\right)=25\)
\(\left(-6\right)x+7=25\)
\(\left(-6\right)x=25-7=18\)
\(x=\frac{18}{-6}=-3\)
c/\(46-\left(x-11\right)=-48\)
\(46-x+11=-48\)
\(x=46-\left[\left(-48\right)-11\right]=105\)
tìm xϵz , biết :
a) 2x2 - 3 = 29
b) -6x - (-7) = 25
c) 46 - (x - 11 ) = -48
a) 2x²-3=29
2x²=32
x²=16
=>x=±4
b)-6x-(-7)=25
=>-6x=18
=>x=-3
c)46-(x-11)=-48
=> x-11=46+48
=>x-11=94
=>x=94+11=105
a) 2 . x2 - 3 = 29
= 2 . x2 = 29 + 3 = 32
= x2 = 32 : 2 = 16
= x2 = 42 ; -42
= x = 4 ; -4
a/ 2x^2 - 3 = 29
2x^2 = 32
x^2 = 16
x = 4;-4
b/ -6x - (-7) = 25
‐6x +7 =25
‐6x = 18
x = ‐3
c/ 46 ‐ ﴾x‐11﴿ = ‐48
46 ‐x +11 = ‐48
46 ‐x = ‐59
x = 105
(x-2).(x+14)=0
(x-2).(x+4)=0
(7-x).(x+19)=0
(x-3)(x-5)<0
2x^2-3=29
-6x-(-7)=25
46-(x-11)=-48
\(1.\left(x-2\right).\left(x+14\right)=0\)
<=>\(\orbr{\begin{cases}x-2=0\\x+14=0\end{cases}}\)
<=>\(\orbr{\begin{cases}x=2\\x=-14\end{cases}}\)
\(2.\left(x-2\right).\left(x+4\right)=0\)
<=>\(\orbr{\begin{cases}x-2=0\\x+4=0\end{cases}}\)
<=>\(\orbr{\begin{cases}x=2\\x=-4\end{cases}}\)
\(\left(x-2\right)\left(x+14\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x+14=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-14\end{cases}}}\)
vậy x= 2 hoặc x=-14
\(\left(x-2\right)\left(x+4\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x+4=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-4\end{cases}}}\)
vậy x=2 hoặc x=-4
\(\left(x-3\right)\left(x-5\right)< 0\)
nên x-3 và x-5 khác dấu
\(th1\Leftrightarrow\orbr{\begin{cases}x-3< 0\\x-5>0\end{cases}\Leftrightarrow\orbr{\begin{cases}x< 3\\x>5\end{cases}}\Leftrightarrow5< x< 3}\left(vl\right)\)
\(th2\Leftrightarrow\orbr{\begin{cases}x-3>0\\x-5< 0\end{cases}\Leftrightarrow\orbr{\begin{cases}x>3\\x< 5\end{cases}}\Leftrightarrow3< x< 5}\left(tm\right)\)
vậy với 3<x<5
thì x=4
x+(-62)+(-46)=-14
84+x=(-32)+(-48)
a. x - 108 = -14
x = 94
b. 84 + x = -80
x = -164
cứu mình điiiiiiiiiiiiiiiiiiiiiiiiiiiiii mọi người!
x+(-62)+(-46)=-14
x+(-108)=-14
x =-14-(-108)
x =94
84+x=(-32)+(-48)
84+x=-80
x=-164
Mình không chắc có đúng không nhưng mong sẽ giúp bạn phần nào =/