\(7,5\cdot x+\left(-1,5\right)\cdot x+11=-13,6\\ 7,5\cdot x+\left(-1,5\right)\cdot x=-13,6-11\\ -13,6\\ 7,5\cdot x+\left(-1,5\right)\cdot x=-24,6\\ x\cdot\left[7,5+\left(-1,5\right)\right]=-24,6\\ x\cdot6=-24,6\\ x=\frac{-24,6}{6}\\ x=-4,1\)
\(7,5\cdot x+\left(-1,5\right)\cdot x+11=-13,6\\ 7,5\cdot x+\left(-1,5\right)\cdot x=-13,6-11\\ -13,6\\ 7,5\cdot x+\left(-1,5\right)\cdot x=-24,6\\ x\cdot\left[7,5+\left(-1,5\right)\right]=-24,6\\ x\cdot6=-24,6\\ x=\frac{-24,6}{6}\\ x=-4,1\)
Bài1: tìm x biết
a) l x - 3,5 l = 7,5
b) l x + \(\dfrac{4}{5}\) l - \(\dfrac{1}{2}\) = 0
c) 3,6 - l x - 0,4 l = 0
d) \(\dfrac{-5}{12}\) : | \(\dfrac{-5}{6}\) : x | = \(\dfrac{-5}{9}\)
e) | x - 3,5|+|4,5- x|=0
bài 2:tính hợp lý
a) (-4,3)=[(-7,5)=(4,3)]
b) 45,3 + [(7,3)+(-22)]
c) [(-11.7)+5.5]+[11.7+(2.5)]
d) [(-6.8)+(-56.9)]+[2.8+5.9]
Cau 2: cho biet 5/x= 2/3 khi do x co gia tri la:
A.10/3
B.7,5
C.2/3
D. 30/4
tim x
\(\dfrac{5}{6}x-\dfrac{3}{4}=\dfrac{-1}{4}+\dfrac{2}{3}\)
\(-1\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{5}{6}-\left(\dfrac{-2}{5}\right)\)
\(\left(\dfrac{4}{5}:x+1,5\right):\dfrac{2}{3}=-1,5\)
\(\dfrac{4}{3}x-\dfrac{2}{3}=\dfrac{1}{4}-x\)
giup minh nhe minh dang can gap
1+x/2014+x+2/2012+x+3/2012=x+10/2005+x+11/2004+x+12/2003 tim x
Bài 7 :
a. x - 2/35 = -2/25 . b.11/12 - ( x + 2/5 ) = 2/3 .
c. 2/5 + 1/4 . x = -3/10 .
tìm x, bt
a)x+1/55+x+3/53+x+5/51=x+7/49+x+9/47+x+11/45
b)x+29/31-x+27/33=x+17/43-x+15/45
Mg ơi, giúp bé vs đc ko ạ!
Tìm x, biết
a. x + \(\dfrac{3}{10}=\dfrac{-2}{15}\)
b. \(\dfrac{-11}{12}x+0,25=\dfrac{5}{6}\)
c. x + (x+1)+(x+2)+........................+(x+2002)=2004
36-(X+6)2= (\(\sqrt{11}\))2
Tính hợp lí nếu có thể:
a)A=10/1/2.(26/1/3-176-7)-12/11.(10/3-1,75)
b)B=(13/84.1,4-2,5.7/180):2/4/9+4/1/2.0,1
c)C=(1-1/4)(1-1/9)(1/16)(1-1/25)...(1-1/10000)
d)D=0,375-0,3+3/11+3/12//-0,625+0,5-5/11-5/12+1,5+1-0,75//2,5+5/3-1,25