Tìm X thuộc N biết
a)100-7:(X-5)=65 b)12x(X-3):3=4^3+2^3
c)20+5xX=5^5:5^3 d)5xX-201+2^4x4
e)(2xX+3)^2=49 g)(7xX+3)^3=800+5^2:8
( 5xX+7):2= 16 128 - 3 x(X - 4)=23 [ (4xX+28) x 3+55 ] :5=35
Tìm x, biết:
a) \(\dfrac{-2}{5}\) + \(\dfrac{4}{5}\) . x = \(\dfrac{3}{5}\)
b) \(\dfrac{-3}{7}\) - \(\dfrac{4}{7}\) : x = \(\dfrac{2}{5}\)
c) \(\dfrac{4}{7}\) . x + \(\dfrac{2}{3}\) = \(\dfrac{-1}{5}\)
d) \(\dfrac{5}{7}\) : x -1 = \(\dfrac{2}{3}\)
tìm x thuộc Z biết:
1) 2(4x-8)-7(3+x)=[-4](3-2)
2) 12(x-4)+6(x-2)-16(x+3)=7[-4]
3) 4(x-5)-7(5-x)+10(5-x)=-3
4) -3[x+5]=15(-3)+7(-3)
5) 4[x-7]-3(-5)=-2[x-7]-10
Tìm x biết:
a) ( x - 1/2) x 5/3 = 7/4 - 1/2
b) ( x - 4/3) x 7/4 = 5 - 7/6
tìm tất cả các số x biết rang 1/3+-2/5+1/6+-1/5<=x<-3/4+2/7+3/7+5/7+-1/4
tính :
a) 1/7 : 5/17 - 3/2 . ( 1/6 - 7/12 )
b) 25/77 - ( 1/5 - 7/15 ) : 10/11 : |-3/4|
c) 4/7 + 15/4 - 11/4 + 3/7 -1/2 + 1/3
tìm x biết :
a) 3/4 . x + 1/2 =3/5
b) x - 5/4 = 1/3 - 3/4 .x
c) -2/3 . ( x - 1/4 ) = 1/3 . ( 2x-1)
