− 2/3 . (x −1/4 ) = 1/3 . (2x − 1) ⇔− 2/3 x + 1/6 = 2/3 x − 1/3 ⇔− 2/3 x − 2/3 x = −1/3 − 1/6 ⇔ -4/3 x = − 1/2 ⇔x = 3/8
− 2/3 . (x −1/4 ) = 1/3 . (2x − 1) ⇔− 2/3 x + 1/6 = 2/3 x − 1/3 ⇔− 2/3 x − 2/3 x = −1/3 − 1/6 ⇔ -4/3 x = − 1/2 ⇔x = 3/8
Tìm x, biết
a)-2x+ -3/4 = x-3/5
b)|1/2x-1/3|-3/2=1/4
tìm x , biết :
a, (x-1/5).(x-1+3/5)<0
b,(x-4/7):(x+1/2)>0
c,(2x-3):(x+1+3/4)
d,|2x-1|+1=2x
Tìm x biết -2/3.(x-1/4)=1/3.(2x=1)
Tìm x biết -2/3.(x-1/4)=1/3.(2x-1)
Tìm x biết
3(X-1/2) - 5(X-2/3) =3/2 x X
2X - 5/4 = (3 - 1/2) (X-1/2)
I x -1 I +1 = 2x - 3
1. Tìm số tự nhiên x biết 1) 3^x . 3=243 2) 7.2^x=56 3) x^3=8 4)x^20=x 5) 2^x-15=17 6) (2x+1)^3=9.81 7) x^6:x^3=115 8) ( 2x-15)^5=(2x-15)^3 9) 3^x+2-5.3^x=36 10) 7.4^x-1+4^x+1=23 Giúp tớ bài này với
tìm x biết 1 ) -2/3(x-1/4)=1/3(2x-10)
Tìm X biết:
X:4 1/3= -2,5
X: -3/5= -10/21
2/3 x-1/2=1/10
1/2x+1/2=5/2
-2/3-1/3(2x-5)=3/2
2/5.x+1/2=-3/4
1/3x-8=1/2
X-1/4=5/8.2/3
B1:Tính nhanh:
a)M= -1/3 . 141/17 - 39/3 . -1/17
b)N= -9/16 . 13/3 - (-3/4)^2 . 19/3
c)P=(1+1/1.3) (1+1/2.4) (1+1/3.5)......(1+1/99.101)
B2:Tìm x,biết
a)1/2+3/2:x=1/4
b)3/4+1/4.x=7
c)1/2.4 + 1/4.6 +.........+1/(2x-2).2x = 11/48
B3:Tìm x,biết
a)(x-1/2)^2=1/81
b)x+x(1+1/x)+x(1+2/x)=1/3
c)2/x+4=3/x+5