a,x-6/7=5/2
x=5/2+6/7
x=47/14
b,12/7:x+2/3=7/5
12/7:x=7/5-2/3
12/7:x=11/15
x=12/7:11/15
x=180/77
c,2/3.x+3/4=3
2/3.x=3-3/4
2/3.x=9/4
x=9/4:2/3
x=27/8
d,720:[41-(2x-5)]=120
[41-(2x-5)]=720:120
[41-(2x-5)]=6
(2x-5)=41-6
(2x-5)=35
2x=35+5
2x=40
x=40:2
x=20
lấy máy tính ra bạn ơi
Tìm x:
a) 2/5 = 3/4 : x = -1/2
b) 5/7 - 2/3 . x = 4/5
c) 1/2x + 3/5x = -2/3
d) 4/7x - x = -9/14
9.x + 1=73
2.x - 5 = -17 - 12
10 - x - 5 = - 5 - 7 -11
(-9) . x + 3 = (-2) . (-7) +16
(-12) . x - 34 =2
(-11).x + 9 =130
(-5) .x + 5 = (-15) .(-4) -12
IxI -3=0
(7 - IxI).(2.x - 4) =0
280-(x-140):35 =270
(1900 - 2.x ) : 35- 32 =16
720 :[41-(2x -5 )] =23 .5
(x - 5).(x2 - 4 ) =0
GIÚP MIK VS ,MIK CẦN GẤP
Bài toán 3 : Tìm x, biết.
a. 2(x – 5) – 3(x + 7) = 14 b. 5(x – 6) – 2(x + 3) = 12
c. 3(x – 4) – (8 – x) = 12 d. -7(3x – 5) + 2(7x – 14) = 28
e. 5(3 – 2x) + 5(x – 4) = 6 – 4x f. -5(2 – x) + 4(x – 3) = 10x – 15
g. 2(4x – 8) – 7(3 + x) = |-4|(3 – 2) h. 8(x – |-7|) – 6(x – 2) = |-8|.6 – 50
k. -7(5 – x) – 2(x – 10) = 15 l. 4(x – 1) – 3(x – 2) = -|-5|
m. -4(x + 1) + 89x – 3) = 24 n. 5(x – 30 – 2(x + 6) = 9
o. -3(x – 5) + 6(x + 2) = 9 p. 7(x – 9) – 5(6 – x) = – 6 + 11x
q. 10(x – 7) – 8(x + 5) = 6.(-5) + 24
Bài 4: Tìm các số nguyên x biết
1) |x + 2| = 4
2) 3 – |2x + 1| = (-5)
3) 12 + |3 – x| = 9
4) |x + 9| = 12 + (-9) + 2
5) 2(4x – 8) – 7(3 + x) = |-4|(3 – 2)
6) 8(x – |-7|) – 6(x – 2) = |-8|.6 – 50
7) -7(5 – x) – 2(x – 10) = 15
8) 4(x – 1) – 3(x – 2) = -|-5|
Tìm x biết
1) 2.(x +5)+3.(x+7)=41. 6) 7. (x -1)+5.(3-x)=11.x-10
2) 5. ( x +6 ) +2.(x-3)=38. 7) 4. (2+x)+3(x-2)=12
3) 7.(5+x)+2.(x-10)=15. 8) 5. ( 2+x) +4.(3-x)=10x-15
4) 3. (x+4)+(8-2.x) =22. 9) 7.(x-2) +5.(3-x)=11x-6
5) 4. (x+5)+3.(7-x)=49. 10) 5.(3-x)+5.(x+4)=6+4x
(2x-4).(3-x) 720 : [ 41-(2x-5)]=22.5 15-x=7-(-2)
Tìm x :
a) 2x - 138 = 2^3 . 3^2
b) 20 - [ 7 . ( x - 3 ) + 4 ] = 2
c) 310 - ( 118 - x ) = 217
d) 2010^5 . ( x - 60 ) = 2010^6
e) 5 . ( x + 35 ) = 515
f) [ ( 6x - 39 ) : 3 ] . 28 = 5628
g) 720 : [ 41 - ( 2x - 5 ) ] = 2^3 . 5
h) ( 6x - 3^4 ) . 7^3 = 3 . 7^4
v) 4x^3 + 12 = 120
m) 3 . 2^x - 3 = 45
--- Giải nhanh, đúng sẽ hậu tạ. '-' ( Trong khả năng ) ---
Bài 1 Tìm x,biết
x.3/5=2/3
x.7/17=17/8
3/4 chia x=-7/12
3/8 - 1/6.x=1/4
1/3+1/2 chia x=-4
Bài 2 Tính
-6/11 chia [3/5 . 4/11]
7/12 + 5/12 chia 6 -11/36
[4/5 + 1/2] chia [3/13 - 8/13]
[2/3 - 1/4 + 5/11] chia [5/12 + 1 -7/11]
*Dấu . là dấu nhân nha mn*
1. | 4-2x | . 1/3 = 1/3
2. (-3)² : | x+(-1) | = (-3)
3. | 3/2 -x | + (-4/5) = -14/5
4. (-4/3) - | 2x + (-1) | = -7/3
5. -9 . | 36 - x/2 | = (-54)
6. 0,75 - | (-x) + 1/3 | = 0,25
7. (-6/5) + | x-9 |= (-6/5)
8. (-4) . | 3x - 1/5 | = 12
