Tính:
10/21 - 1.251 +11/21 + 2.251
tìm x:
c) (3x-1)^2 :7= 7
d) (7-2x)^3 =(1/2)^2 nhân (-1/2)
CẦN GẤP LẮM Ạ!
tìm các số nguyên x biết | x+2 | = 1/2-1/3+1/4/1/2+1/3-1/4+2/11-1/7+3/10/7/11-1/2+21/20
Giúp với ạ ! Mình đang cần lắm !
Cần gấp lắm , giúp nha , hứa thick
a)11/13 - ( 5/42 - x ) = -(15/28 - 11/13)
b) x + 1/3 = 2/5-(-1/3)
c) 2/3x + 5/7 = 3/10
d)3/7-x=1/4-(-3/-5)
e)-21/-13.x+1/3=-2/-3
Thick nhiều ạk
a) x= \(\frac{-5}{12}\)
b) x = \(\frac{2}{5}\)
c) x =\(\frac{-87}{140}\)
d) x = \(\frac{109}{140}\)
e) x = \(\frac{13}{63}\)
Làm đầy đủ nha , mk thick cho , đừng viết kết quả
a) \(\frac{11}{13}\)- (\(\frac{5}{42}\)- X ) = -(\(\frac{15}{28}\)-\(\frac{11}{13}\))
\(\frac{5}{42}\)- X =\(\frac{11}{13}\)+\(\frac{15}{28}\)-\(\frac{11}{13}\)
\(\frac{5}{42}\)- X =\(\frac{15}{28}\)
X = \(\frac{5}{42}\)-\(\frac{15}{28}\)
X = \(\frac{-5}{12}\)
b) X + \(\frac{1}{3}\)= \(\frac{2}{5}\)- ( \(\frac{-1}{3}\))
X +\(\frac{1}{3}\) = \(\frac{11}{15}\)
X = \(\frac{11}{15}\)-\(\frac{1}{3}\)
X = \(\frac{2}{5}\)
c) \(\frac{2}{3}\)X +\(\frac{5}{7}\)=\(\frac{3}{10}\)
\(\frac{2}{3}\)X = \(\frac{3}{10}\)-\(\frac{5}{7}\)
\(\frac{2}{3}\)X =\(\frac{-29}{70}\)
X = \(\frac{-29}{70}\): \(\frac{2}{3}\)
X = \(\frac{-87}{140}\)
d) \(\frac{3}{7}\)- X =\(\frac{1}{4}\)- (\(\frac{-3}{-5}\))
X = \(\frac{3}{7}\)-\(\frac{1}{4}\)+\(\frac{3}{5}\)
X = \(\frac{109}{140}\)
e) \(\frac{-21}{-13}\)X +\(\frac{1}{3}\)=\(\frac{-2}{-3}\)
\(\frac{-21}{-13}\)X = \(\frac{-2}{-3}\)-\(\frac{1}{3}\)
\(\frac{-21}{-13}\)X =\(\frac{1}{3}\)
X = \(\frac{1}{3}\):\(\frac{-21}{-13}\)
X = \(\frac{13}{63}\)
Hk tốt
tìm x
a) x/7 = 6/21
b)2/3x -1/2=1/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
a) x/7 = 6/21
x/7 = 2/7
=>x=2
b)2/3x -1/2=1/10
2/3x = 1/10+1/2
2/3x = 3/5
x=3/5:2/3
x=9/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
a) x/7 = 6/21
x/7 = 2/7
=>x=2
b)2/3x -1/2=1/10
2/3x = 1/10+1/2
2/3x = 3/5
x=3/5:2/3
x=9/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
1; (x - 3/5) : -1/3 = 2/5
2; 3/7 x - 2/3 x = 10/21
Ai giúp mk vs ạ mk cần gấp lắm mơn
\(\left(x-\frac{3}{5}\right)=\frac{2}{5}×-\frac{1}{3}\)
\(\left(x-\frac{3}{5}\right)=-\frac{2}{165}\)
\(x=-\frac{2}{165}+\frac{3}{5}\)
\(x=\frac{97}{165}\)
vậy \(x=\frac{97}{165}\)
\(x×\left(\frac{3}{7}+\frac{2}{3}\right)=\frac{10}{21}\)
\(x×\frac{23}{21}=\frac{10}{21}\)
\(x=\frac{10}{21}:\frac{23}{21}\)
\(x=\frac{10}{23}\)
vậy \(x=\frac{10}{23}\)
\(\left(x-\frac{3}{5}\right):\frac{-1}{3}=\frac{2}{5}\)
=> \(x-\frac{3}{5}=\frac{2}{5}\cdot\left(-\frac{1}{3}\right)=-\frac{2}{15}\)
=> \(x=-\frac{2}{15}+\frac{3}{5}=-\frac{2}{15}+\frac{9}{15}=\frac{7}{15}\)
\(\frac{3}{7}x-\frac{2}{3}x=\frac{10}{21}\)
=> \(\left(\frac{3}{7}-\frac{2}{3}\right)x=\frac{10}{21}\)
=> \(-\frac{5}{21}x=\frac{10}{21}\)
=> \(x=\frac{10}{21}:\frac{-5}{21}=\frac{10}{21}\cdot\frac{-21}{5}=-2\)
Hai bài của ☆luffy cute☆ đều sai hết , xem xét lại đi nhé
1 ) \(\left(x-\frac{3}{5}\right)\div-\frac{1}{3}=\frac{2}{5}\)
\(\Rightarrow x-\frac{3}{5}=\frac{2}{5}\cdot\left(-\frac{1}{3}\right)=-\frac{2}{15}\)
\(\Rightarrow x=-\frac{2}{15}+\frac{3}{5}=-\frac{2}{15}+\frac{9}{15}\)
\(\Rightarrow x=\frac{7}{15}\)
2 ) \(\frac{3}{7}x-\frac{2}{3}x=\frac{10}{21}\)
\(\Rightarrow\left(\frac{3}{7}-\frac{2}{3}\right)x=\frac{10}{21}\)
\(\Rightarrow-\frac{5}{21}x=\frac{10}{21}\)
\(\Rightarrow x=\frac{10}{21}\div-\frac{5}{21}\)
\(\Rightarrow x=-2\)
b1 tính nhanh nếu cs thể
1 (1-2x)*2 +8=17
2 (x+3)*3:3-1=-10
3 (3x-1)*3-2=-66
b2 tìm số nguyên n,bt
1 15+14+13+12+...+n=0
2 (n-3)+(n-2)+(n-1)+...+10+11=11
b4 tìm xy
1 xy+3x-7y=21
2 xy+3x -2y=11
jup e vs ạ nhanh vs đúng e tịk choo
nhanh lên ạ cần gấp lắm lun><
b3
* lak mũ nha
Đây là bài tìm x mà bạn
bài 1:
1/ (1-2x)2+8=17
(1-2x)2=17-8
(1-2x)2=9
(1-2x)2=32
\(\Rightarrow\orbr{\begin{cases}1-2x=3\Rightarrow2x=-2\Rightarrow x=-1\\1-2x=-3\Rightarrow2x=4\Rightarrow x=2\end{cases}}\)
Vậy x=-1 hoặc x=2
2/ (x+3)3:3-1=-10
(x+3)3:3=-10+1
(x+3)3:3=-9
(x+3)3=-9.3
(x+3)3=-27
(x+3)3=(-3)3
x+3 =-3
x =-3-3
x =-6
Vậy x=-6
3/ (3x-1)3-2=-66
(3x-1)3=-66+2
(3x-1)3=-64
(3x-1)3=(-4)3
3x-1 =-4
3x =-4+1
3x =-3
x =-3:3
x =-1
Vậy x=-1
a)-15/4:21/-10
b)-7/14:(-0,14)
c)(-11/15): 1 1/10
d)2 1/7 :1 1/14
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN MỌI NGƯỜI NHIỀU!
a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)
b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}.\dfrac{-50}{7}=\dfrac{25}{7}\)
c) \(\left(\dfrac{-11}{15}\right):1\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{10}{11}=\dfrac{-2}{3}\)
d) \(2\dfrac{1}{7}:1\dfrac{1}{14}=\dfrac{15}{7}.\dfrac{14}{15}=2\)
\(a.-\dfrac{15}{4}:\left(\dfrac{21}{-10}\right)\)
\(=-\dfrac{15}{4}\cdot\left(-\dfrac{10}{21}\right)\)
\(=\dfrac{25}{14}\)
\(b.-\dfrac{7}{14}:\left(-0,14\right)\)
\(=-\dfrac{1}{2}:\left(-\dfrac{7}{50}\right)\)
\(=\dfrac{25}{7}\)
\(c.\left(-\dfrac{11}{15}\right):\left(1\dfrac{1}{10}\right)\)
\(=\left(-\dfrac{11}{15}\right):\dfrac{11}{10}\)
\(=-\dfrac{2}{3}\)
\(d.\left(2\dfrac{1}{7}\right):\left(1\dfrac{1}{14}\right)\)
\(=\dfrac{15}{7}:\dfrac{15}{14}\)
\(=2\)
a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)
b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}:\dfrac{-7}{50}=\dfrac{-7}{14}.\dfrac{50}{-7}=\dfrac{25}{7}\)
c) \(\dfrac{-11}{15}:1.\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{1}{10}=\dfrac{-11}{150}\)
d) \(\dfrac{21}{7}:1.\dfrac{1}{14}=3.\dfrac{1}{14}=\dfrac{3}{14}\)
Tìm x
a) 4(x+2) - 7(2x - 1) + 9(3x - 4)=30
b) 2(5x - 8) - 3(4x - 5) = 4(3x - 4) + 11
c) 5x(1 - 2x) - 3x(x + 18) = 0
d) 5x - 3{4x - 2[4x - 3(5x - 2)]} = 182
E đang cần gấp lắm ạ, cảm ơn ạ:)
a) 4(x+2) - 7(2x - 1) + 9(3x - 4)=30
⇔4x+8 - 14x + 7 + 27x - 36 = 30
⇔ 17x = 51
⇔ x = 3
b) 2(5x - 8) - 3(4x - 5) = 4(3x - 4) + 11
⇔ 10x - 16 - 12x + 15 = 12x - 16 + 11
⇔ -14x = -4
⇔ x= \(\frac{2}{7}\)
c) 5x(1 - 2x) - 3x(x + 18) = 0
⇔ 5x - 10x\(^2\) - 3x\(^2\) -54x =0
⇔ -13x\(^2\) -49 x = 0
⇔ -x ( 13x + 49 ) =0
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\13x+49=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\frac{-49}{13}\end{matrix}\right.\)
d) 5x - 3{4x - 2[4x - 3(5x - 2)]} = 182
⇔ 5x - 3[ 4x - 2( 4x - 15x + 6 ) ]= 182
⇔5x - 3 ( 4x - 8x + 30x - 12 ) = 182
⇔ 5x - 3 ( 26x - 12 ) = 182
⇔ 5x - 78x + 36 = 182
⇔ - 73x = 146
⇔ x = -2
Tìm x biet:
a,5/2x+x=32/15
b,x-7/2x=-32/15
c,-7/3x-7/4x+11/3=18/5
d,-5/6-3x=2/3
e,2x-5/9=-2/3
f,1/2-2/3x=7/12
g,7-|2x-3|=4
h,(19x+2.5^2):14=(13-8)^2-4^2
i,3/4x-2/3=2/7.1/6+5/7.1/6
k,(x+1/2).(2/3-2x)=0
l,x/2013-1/10-1/15-1/21-........-1/120=5/8
Tìm x Biết :
a) |2x-3|+x=21
b) |2x-5|+x=2
c) |2x-7|=2x+1
d) |2x-5|=x+1
CÁC BẠN ƠI GIÚP MÌNH NHA. MÌNH ĐANG CẦN ĐÁP ÁN GẤP GẤP LẮM!!!
a) |2x-3|+x=21
|2x-3|=21-x
\(\Rightarrow\)\(\orbr{\begin{cases}2x-3=21-x\\2x-3=-\left(21-x\right)\end{cases}}\)
TH1: 2x-3=21-x
2x-x=21+3
x=24
TH2: 2x-3=-(21-x)
2x-3 = -21+x
2x-x=-21+3
x=-18
Vậy x \(\varepsilon\){-18;24}