\(3\left(x-\dfrac{1}{2}\right)-5\left(x+\dfrac{3}{5}\right)=-x+\dfrac{1}{5}\)
\(\Rightarrow3x-\dfrac{3}{2}-5x-3=-x+\dfrac{1}{5}\)
\(\Rightarrow-2x-\dfrac{-9}{2}=-x+\dfrac{1}{5}\)
\(\Rightarrow-2x+x=\dfrac{9}{2}+\dfrac{1}{5}=4,7\)
\(\Rightarrow x=-4,7\)
Bài 2:Tìm x biết:
a)\(\dfrac{1}{7}+x=\dfrac{-2}{3}\)
b)\(\dfrac{-2}{3}:x=\dfrac{-5}{6}\)
c)\(\left\{\dfrac{3}{5}-2x\right\}.\dfrac{5}{8}=1\)
d)\(\dfrac{3}{4}+\dfrac{2}{5}x=\dfrac{29}{60}\)
e)\(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
f)\(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
g)\(\left|X+\dfrac{1}{3}\right|-4=\dfrac{-1}{2}\)
h)\(\left(\dfrac{1}{32}\right)^x.8^{2x}=512\)
i)\(5,3x+\left(-3,3\right)x+1,7=-4,9\)
a, x+2/3=5/6. 3/10
b, 7/9-5/9:x=1/6
c, |x|+1/5=3/2
Bỏ ngoặc rồi tìm x
1, 125 + ( x - 5 ) = 130
2, 127 - ( 5 - x ) = 120
3, 25 - ( x - 3 ) = 12 - x
4, ( -2 )3 - ( x - 5 ) = -3 + x
5, 3 . ( -2 )2 - ( 6 - x ) = 13
a) \(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):\left(-16\frac{2}{3}\right)=0\)
b) \(\left(\frac{x}{3}-5\frac{1}{4}\right)^2-\frac{-2}{5}=1\frac{1}{25}\)
c) \(\frac{17-x}{12}=\frac{3}{17-x}\)
d) \(1\frac{1}{3}-25\%\left(x-\frac{8}{3}\right)+2x=1,6:\frac{3}{5}\)
tìm cặp số nguyện x,y
a) x.(4-y)=-3
b) (x-1).(y-5)=7
c) (xy-3).(x+2)=-5
d) (x-1).(2-y)=-5
e) x^2-xy=7
g) (x+3).(xy+2)=3
Tìm x biết:
a. -2/3.x+1/5=3/10/3x-1/2=1/10
b. |x|=3/4=5/3
c. 2/3x-1/2=1/10
d. 3/5+4/9:x=2/3
e. |x+75phần trăm|=11/5
f. (x+1/2).(2/3-2x)=0
g. 2/3x-3/2x=5/12
h. |2x-1/3|+5/6=1
i. x+2/5=7/12-5/4
j. (14/5x-50):2/3=51
k. 2/5+3/5.(3x-3,7)=-53/10
l. 7/9:(2+3/4x)+5/9=23/27
Bài 1: Thực hiện phép tính
a, A= -5/6. 3/10
b, B= 1/3- 1/4- +1/12
Bài 2: Tính hợp lí
A= (-1/5). 15/4+ |4/5- 14/5| : 8/3
B= (-1/2)^2 : 1/3/8 + 25%. 3/11
C= -8/5 +0,6+ |-1/2| +1/2
D= -5/9.2/13+ -5/9: 13/11 +1/5/9
Bài 3: Tìm x, biết:
a, x/2+3/4= 1/4
b, 3/5x + 0,4x = 2
c, x/-3= 7/6 + (-15/18)
d, Tìm x thuộc Z biết:
4/3. (1/6 -1/2) <x< 2/3. (-1/6 + 3/4)
Giúp em giải bài này với ạ Tính A=1/(x+1)(x+2) + 1/(x+2)(x+3) + 2/(x+3)(x+4) + 4/ (x+4)(x+5) + 8/ (x+5)(x+6)
tìm x
\(\dfrac{5}{3}x-2\dfrac{1}{3}=-\dfrac{4}{3}.1\dfrac{1}{8}-\dfrac{2}{3}\)
\(2\dfrac{1}{6}:x-\dfrac{-5}{8}=\dfrac{-7}{15}:4\dfrac{1}{5}-\dfrac{-6}{7}\)
\(\left(\dfrac{5}{6}x-0,3\right):2\dfrac{1}{3}=25\%\)
\(\dfrac{4}{7}-\dfrac{2}{3}x=1,5+\dfrac{4}{5}x\)
GIÚP MÌNH NHÉ
