a ) x = 2
b ) x = 7
c ) x = 5
d ) đề sai ......! hoặc x = rỗng .
e ) x = 5
a ) x = 2
b ) x = 7
c ) x = 5
d ) đề sai ......! hoặc x = rỗng .
e ) x = 5
(5.x-1):3+1=4
b 54:(16-x)-1=5
c 3^2.x+15=60'''2x^3=54
e 2^x+1=64
5 . x -1 : 3 + 1 = 4
54 : ( 16 - x ) - 1 = 5
c( 32 . x + 15 = 60
d) 2x3 = 54
e) 2x+1 = 64
Tính:
a) 16/15 . -5/14 . 54/24 . 56/21
b)7/3 . -5/2 . 15/21 . 4/-5
c)( -2/5 + 1/3) . ( 3/2 - 3/7)
d)(1/2 - 1/3) . ( 5 - 1/4)
e) ( 4/5)^2
Bài3 tính nhanh
c. 456:2x 18+456:3-102
bài 4 tìm số tự nhiên n sao cho
121/27x 54/11<n<100/21:25/126
Bài5
x/17=60/204 6+x/33=7/11 12+x/43-x=2/3
x/5<3/7 1<11/x<2 15/26+x/16=46/52
bài6 tính nhanh
21,251+6,058+0,749+1,042 1,53+5,309+12,47+5,691
1 . Tìm x biết :
a . 2x - ( x + 15 - 29 ) = 17 - 11
b . 49 - ( x - 12 + 54 ) = 2x + 49
c . ( 2x - 5 ) . 2 = 49
d . 2 . | x - 3 | -1 = 6
e . 3 . | x + 1 | - 2 = 4
f . 4 x + 2 + 4 x = 1088
a. 11 - (x + 84) = 97
c. 416 + ( x - 45) = 387
d. - (x + 84) + 213 = - 16
e. - 3x + 5 = 41
g. | x | + | - 5 | = | 37 |
h. | -6 |.|x| = 54
i. | 2x - 5 | = 13
j. |x + 8| = 6
n. (2x + 1) (3y - 2) = - 55.
o. (x - 3) (2y + 1) = 7
p. - 12(x - 5) + 7(3 - x) = 5
q.
x - 1 8
= 9 3
k. (x - 2)(5 - x) = 0
l. x (x+3) = 0
m. (x-1)(x2
+ 1) = 0
TIM X E N, BIET:
A.(X+2)X-1=150
B,(5-X)X=1 (X<5)
C.15X-2=225
D.(X+2)2.(X+1)=64
E.(X-5)3.(X-5)=16
F. X2.(X-3)=54
G.(X+5)X=1
K.(X+7)x^2=150
Tìm x
a) ( 2x -1)+3/15= 3/2
b) x+ 46/15= 1,5
c) ( -2x +1) + 3/15= 5/3
d) -13/3 -2x -1= 0,6
e) 3x -1/2x = 7/2-3
f) x÷5=6÷7
g) 2x-1/3 = 16/3
a. x+ ( -12-16 ).x=54
b.(-11)2.x=72+10.13.x
c.-2.( x+3 )+3.(x-2)+5.(3-x)=45
d.(x+3).(x-2)<0
e.(2x-4). (x+5)>0