a: \(x-\dfrac{7}{2}=-\dfrac{5}{6}\)
=>\(x=-\dfrac{5}{6}+\dfrac{7}{2}=\dfrac{-5}{6}+\dfrac{21}{6}=\dfrac{16}{6}=\dfrac{8}{3}\)
b: \(\left(3,5-\dfrac{3}{7}x\right):\dfrac{2}{3}=0,75\)
=>\(3,5-\dfrac{3}{7}x=\dfrac{3}{4}\cdot\dfrac{2}{3}=\dfrac{1}{2}\)
=>\(\dfrac{3}{7}x=3,5-\dfrac{1}{2}=3\)
=>x=3:3/7=7
a)-1/21 + -1/28 b)-8/18 - -15/ 27 c) -5/ 12 +0,75 d) 3,5 - (-2/7) e) 3/7 +( -5/2) + (-3/5) f) (-4/3) + (-2/5) +(-3/2)
g) 4/5 - (-2/7) -7/10 h) 2/3 - [(-7/4) - ( 1/2 + + 3/8)
3/7 x 1/2 + 0,5 x 4/7 + 0,125 x 16 + 84 x 1/8
0,75 x 6 + 49 x 3/4 + 3/4 x 24 x 0,75
1/3 x 4/5 + 2/3 + 1/3 +6/5
Tìm x, biết:
a) \(-\dfrac{3}{5}\) - x = -0,75
b) \(1\dfrac{4}{5}\) = -0,15 - x
c) \(2\dfrac{1}{2}\) - x +\(\dfrac{4}{5}\) = \(\dfrac{2}{3}\) - ( \(-\dfrac{4}{7}\))
Bài 1
A) 3/2+9/2 -6
B) -5/4:(1/4-7/8)+3/2 x(1/3-5/6)
C) (-2,5)x0,65 -1.5 x 0,3+(-0,35)x1,5
A.50% x hỗn số 1 1/3 x 10 x 7/35 x 0,75
B.1/4 x 8/5 x (5/4)mũ 2 : -4/7
C.6/7 + 5/8 : 5 - 3/13 x (-2)mũ 2
a) -5/8 + x = -7/6
b) x - -3/4 = -14/25
c) x. 9/-13 = -33/26
d) 4/-9 : x = -5/3
e) 4/7 .x - 2/3 = 1/5
f) 4/5 + 5/7 : x = 1/6
A= -1/21 + -1/28
B= -8/18 - 15/27
C= -5/12 + 0,75
D= 3,5-{-2/7}
tính giá trị biểu thức nha giúp tui đi
a,x - 1/2 - (-1/6)
b,x + 5/6 = 3/8
c,2/3 . x -1/2 = 5/6
d, x/7 = 6/-21
e,(7/3 x -0,6) : 3^2/5 = 1
f,x/45 = 5/6 + -29/30
g,(4,5 - 2x) . (-1^4/7) =11/14
h,-2/7 + 4/7x=5/7
Tính giá trị của biểu thức:
\(A=\dfrac{-3}{7}.\dfrac{5}{9}+\dfrac{4}{9}.\dfrac{-3}{7}+\left(-2022\right)^0\)
\(B=0,75-\left(2\dfrac{1}{3}+0,75\right)+3^2.\left(-\dfrac{1}{9}\right)\)
\(C=2\dfrac{6}{7}.\left[\left(\dfrac{-7}{5}-\dfrac{3}{2}:\dfrac{-5}{-4}\right)+\left(\dfrac{3}{2}\right)^2\right]\)
\(D=\dfrac{2}{7}+\dfrac{5}{7}.\left(\dfrac{3}{5}-0,25\right).\left(-2\right)^2+35\%\)
\(E=1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):1\dfrac{2}{5}\)
\(F=\dfrac{\dfrac{5}{3}-\dfrac{5}{7}+\dfrac{5}{9}}{\dfrac{10}{3}-\dfrac{10}{7}+\dfrac{10}{9}}\)
Bài 1: Tìm x, biết:
a) (0,75 x + 5/2) - 4/7 - (-1/3) = -5/6
b) (4 x - 9) . (2,5 + -7/3 x) = 0
Thanks
