1a. 21.: ( 2x + 5 )
b. x +2 .: 12 (x < 10 )
tim x biet : a,-12/21×x + 3/7=-4/3, b, 2x +-3^2=5/4 , c, 75% x- 2/5=3/10, d, (3x-2)×(x+7)
Tìm số nguyên x biết :
a) 4x - 12 = 2x - 15
b) 2x + 3. ( x - 5 ) = -45
c) -13 - 2x2 = -21
d) 3. ( x + 2 ) - 6. ( x - 5 ) = 2. ( 5 - 2x )
e) ( x + 12 )2 - 37 = -12
Bài 1A) 12-(23-17) |-15|=(3-x)-23-8|-9|)B)15-(5 x)=7-|-4| (5-9 |-6|-15)Bài 2A) (3x 2)^3=-64B) 2x-3=-33
Tìm x thuộc Z, biết:
a)27<20+|x|<32
b)-12+[|x|+(-9)] = (-5)2 -21
c) x-{x- [x-(-x+1)]}=1
d) (x+3).(2x+10).(x4+5) =0
1 . tìm các số tự nhiên x , sao cho
a) .21 .: ( 2x + 5 )
b) x+2 .: 12 ( x < 10 )
Tìm x, biết:
a) (x- 5.9).2 = 0;
b) 21. (32 - x) = 21;
c) 25.(2.x - 4).12 = 0;
d) (x- 4) : 6 - 5 = 10.
a) 15– (x –7)=-21
b) -12( x –5)+7(3– x)=5
c)2x^2–3=29
tìm x
a) x/7 = 6/21
b)2/3x -1/2=1/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5