(3x - 15)7 = 0
=> 3x - 15 = 0
=> 3x = 15
=> x = 5
42x-6 = 40
=> 2x - 6 = 0
=> 2x = 6
=>x = 3
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Tìm x biết :
a) (3x-15^7)=0
b) 4^2x-6=1
c) (3-x)^10x:(3-x)^20=1 (x#3)
d) (x-6)^3=(x-6)^2
Tìm số tự nhiên x biết
A) ( 3x - 15 )^7 = 0
B) 4^2x-6 = 1
C) ( 3 - x ) ^10x : ( 3 - x ) ^ 20 = 1
D) ( x - 6 )^ 3 = ( x - 6 ) ^2
1. Tìm 1 số tự nhiên x,biết
a.7*7x+1=343
b.23*2x=64
c.(3x-15)7=0
d.4(2x-6)=1
e.(3-x)10x:(3-x)20=1 (x khác 3)
f.(x-6)3=(x-6)2
tìm x,biết:
a. (3x-15)^7=0
b.4^2x-6=1
c. (3-x)^10x:(3-x)^20x=1
d.(x-6)^3=(x-6)^2
Tìm x thuộc N,biết:1) 42x-6 12) (3x-9)7 03) (3-x)10x : (3-x)20 1 (với x khác 3)4) (x-6)3 (x-6)25) { [ (2x+14):22 -3 ]:2 } -1 06) 10- {[(x:3+17) : 10 + 3.24 ]:10 } 57) x10 1x8) x10 x9) (2x - 15)5 (2x - 15)310) ( 7x -11 )3 25.52 + 200
Đọc tiếp
Tìm x thuộc N,biết:
1) 42x-6 =1
2) (3x-9)7 = 0
3) (3-x)10x : (3-x)20 =1 (với x khác 3)
4) (x-6)3 = (x-6)2
5) { [ (2x+14):22 -3 ]:2 } -1 = 0
6) 10- {[(x:3+17) : 10 + 3.24 ]:10 } = 5
7) x10 = 1x
8) x10 = x
9) (2x - 15)5 = (2x - 15)3
10) ( 7x -11 )3 = 25.52 + 200
Bài toán 3 : Tìm x, biết.a. 2(x – 5) – 3(x + 7) 14 b. 5(x – 6) – 2(x + 3) 12c. 3(x – 4) – (8 – x) 12 d. -7(3x – 5) + 2(7x – 14) 28e. 5(3 – 2x) + 5(x – 4) 6 – 4x f. -5(2 – x) + 4(x – 3) 10x – 15g. 2(4x – 8) – 7(3 + x) |-4|(3 – 2) h. 8(x – |-7|) – 6(x – 2) |-8|.6 – 50k. -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) 9o. -3(x – 5) + 6(x + 2) 9 p. 7(x – 9) – 5(6 – x) – 6 + 11xq. 10(x – 7) – 8(x + 5) 6.(-5) + 24
Đọc tiếp
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
tìm x
(3x-15)7=0
42x-6=1
(3-x)10x:(3-x)10=1(173)
Tìm số nguyên x, biết
a) x – 2 = -6
b)15 – (x – 7) = -21
c)4.(3x – 4) – 2 = 18
d) (3x – 6) + 3 = 32
e) (3x – 6) . 3 = 32
f) (3x – 6) : 3 = 32
g) (3x – 6) - 3 = 32
h) (3x -2 mũ4 ).7mũ3 = 2.7mũ4
i) |x| = |-7| k) |x+1| = 2
l)|x – 2| = 3
m) x +|-2| = 0
o) 72 – 3.|x + 1| = 9
p) |x+1| = 3 và x+1< 0
q) (x – 2).(x + 4) = 0
1/ tính
a,1+3+5+7+...+9
b,1+3+5+7+...+99
c,2+4+6+8+...+10
d,36+37+38+...+70
2/tìm x
a,3x+15=30
b,72-x=64+2x
c,45x-3x=40+2x
d,3x+x=56
e,x-3=0
f,42x=172+x
g,3x=0
h,18.[x-1]=18
i,420.[x-2]=0