-112-56:x2=-126
Tìm x
-112 - 56 : x2 = -126
-112 - 56 : x^2 = -126
56 : x^2 = -112 - (-126)
56 : x^2 = 14
x^2 = 56 : 14
x^2 = 4
x = 2
-112 - 56 : x2 = -126
-56 : x2 =-112 -126
- 56 : x2 = - 228
x2 = -228 * -56
x2 = 12768
=> x = \(\sqrt{12768}\)= \(4\sqrt{798}\)
-112-56:x^2= -126
\(\Rightarrow\)-56:x^2= -126+112
\(\Rightarrow\)-56:x^2= -14
\(\Rightarrow\)x^2 = -56:(-14)
\(\Rightarrow\)x^2 = 4
\(\Rightarrow\)
Cho x 1 là giá trị thỏa mãn 1 2 - 2 3 x - 1 3 = - 2 3 và x 2 là giá trị thỏa mãn 5 6 - x = - 1 12 + 4 3 . Khi đó x 1 + x 2 bằng
A. 8 3
B. - 5 12
C. 9 4
D. 11 6
Đáp án D
+ ) 1 2 - 2 3 x - 1 3 = - 2 3 2 3 x - 1 3 = 1 2 - - 2 3 2 3 x - 1 3 = 7 6 2 3 x = 7 6 + 1 3 2 3 x = 3 2 x = 3 2 : 2 3 x = 9 4
Nên x 1 = 9 4
+ ) 5 6 - x = - 1 12 + 4 3 5 6 - x = 5 4 x = 5 6 - 5 4 x = - 5 12
Nên x 2 = - 5 12
Từ đó x 1 + x 2 = 9 4 + - 5 12 = 11 6
Tìm x:
a) -2x - 11 chia hết cho 3x + 2
b) -112 - 56 : x2 = -126
c) 2. (x-7) - 3. ( 5-x ) = -109
d) ( x - 7 ) chia hết cho ( x+6)
Tìm x
a)-2x-11 chia hết cho 3x+2
b)-112-56:x2=-126
c)2.(x-7)-3.(5-x)=-109
d)x-7 chia hết cho x+6
a: \(\Leftrightarrow6x+33⋮3x+2\)
\(\Leftrightarrow3x+2\in\left\{1;-1;29;-29\right\}\)
hay \(x\in\left\{-\dfrac{1}{3};-1;9;-\dfrac{31}{3}\right\}\)
b: \(\Leftrightarrow56:x^2+112=126\)
\(\Leftrightarrow56:x^2=14\)
=>x2=4
=>x=2 hoặc x=-2
c: =>2x-14-15+3x=-109
=>5x-29=-109
=>5x=-80
hay x=-16
tính ( ghi rõ các bước )
112 x 56 + 112 x 46 - 112 x 2
112 x 56 + 112 x 46 - 112 x 2
122 x ( 56 + 46 - 2 )
122 x 100
12200
Tìm x thuộc z biết
a)2.(x-3)-3.(x-5)=4.(3-x)-18
b)-2x-11 chia hết cho 3x+2
c)-112-56:x 2=-126
d)2.(x-7)-3.(5-x)=-109
e)x-7 chia hết cho x+6
a: =>2x-6-3x+15=12-4x-18
=>-x+9=-4x-6
=>3x=-15
hay x=-5
b: \(\Leftrightarrow6x+33⋮3x+2\)
\(\Leftrightarrow6x+4+29⋮3x+2\)
\(\Leftrightarrow3x+2\in\left\{1;-1;29;-29\right\}\)
hay \(x\in\left\{-\dfrac{1}{3};-1;9;-\dfrac{31}{3}\right\}\)
c: \(\Leftrightarrow56:x^2+112=126\)
\(\Leftrightarrow56:x^2=14\)
\(\Leftrightarrow x^2=4\)
=>x=2 hoặc x=-2
112+114+116+118+120+122+124+126+148+130
112+114+116+118+120+122+124+126+148+130=1230
chúc bn hok giỏi
112+114+116+118+120+122+124+126+148+130
=1230
đ/s: 1230
112+114+116+118-120+122+124+126+128
Tính nhanh : [giải ]
=(112+128)+(114+126)+(116+124)+(118+122)+120
=240+240+240+240+120
= 120+120+120+120+120+120+120+120+120
= 120 x 9
= 1080
tich nha ban oi , thanks
=(112+118)+(114+126)+(118+122)+120+116
=230+240+240+120+116
=470+360+116
=830+116
=946
112+114+116+118+120+122+126+128
=(112+128)+(114+126)+(118+122)+120+116
=240+240+240+120+116
=240x3+120+116
=720+120+116
=840+116
=956
Tìm x ,biết: a)5.(2x-1)-27=-112 b)2.(x+126)-218=-512 c)2.[(x+18)-58]+116=-724