(x - 5)4 = (x - 5)6
=> (x - 5)4 [1 - (x - 5)2] = 0
=> (x - 5)4 (1 - x2 + 10x - 25) = 0
=> (x - 5)4 (-x2 + 10x - 24) = 0
=> (x - 5)4 (x - 6)(x - 4) = 0
=> x - 4 = 0 => x = 4
hoặc (x - 5)4 = 0 => x - 5 = 0 => x = 5
hoặc x - 6 = 0 => x = 6
Vậy x = {4;5;6}
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
1) 7. (3x+5)+2.(7x+14)=98. 2) 4. (x -5)+3.(x+7)=22
3) 5.(4-x) +7.(x-2)=24. 4) 3.(x -5)+6.(x+3)=12
5) 4-x+5.(x+2)=38. 6) 5.( x-3)+2.(x+8)=22
7) 5.(x-7)+10.(4+x)=20. 8) 4.(x+10)+8.(x-3)=24
9) 4.(5-x)+5.(x-2)=15. 10) 4.(x-1)+3.(x-2)=-1
Tìm số tự nhiên x
a) 10 + 2.x = 4^5 : 4^3
b) 15 - 3x = 6^5 : 6^4
c) 4x + 9 = 5^5 : 5^3
d) 5^x = 36
e) 4^x = 4^5
f) 6^x = 6^12
Tìm số tự nhiên x
a) 10 + 2.x = 4^5 : 4^3
b) 15 - 3x = 6^5 : 6^4
c) 4x + 9 = 5^5 : 5^3
d) 5^x = 36
e) 4^x = 4^5
f) 6^x = 6^12
1/ 10(X-7)-8(X+5)=6(-5)+24
2/ 8(X-|-7|)-6(X-2)=|-8|.6-50
3/ 2(4X-8)-7(3+X)=|-4|(3-2)
4/ 12(X-4)=6(x-2)-16(X+3)=7|-4|
5/ 4(X-5)-7(5-X)+10(5-X)=-3
bn nào giải giúp mik vs nha:)))
tìm tổng của các số nguyên thoả mãn :
1) -4<x<3
2) -5<x<5
3) -10<x<6
4) -6<x<5
5) -5<x<2
1) x +1/2 =5/3. 2) 3/5 - x =1/3. 3) 3/4 + x =7/2
4) x - 4/3 =7/9. 5)x - 5/6 = 7/3. 6)x- 1/5 =9/10
5(3-2x) 5(4-x)=6-4x
-5(2-x)+4(x-3)=10x-15
-7(5-x)-2(x-10)=15
-4(x+1)+89x-3)=24
5(x-30-2(x+6)=9
help,cần gấp
