4-(27-3)=x-(13-4)
4-24=x-9
=>x-9=4-24
x-9=-20
x=-20+9
x=-11
4-(27-3)=x-(13-4)
4-24=x-9
=>x-9=4-24
x-9=-20
x=-20+9
x=-11
tim so nguyen x biet :
4 - (27-3) = x - (13-4).
tim x
4-(27-3)=x-(13-4)
ai k mk rui mk k lai
tính giá trị các biểu thức:
1) A=7/10 x11 + 7/11 x 12 + 7/12 x 13 + ...... +7/69 x 70
2)B= 1/25 x 27 + 1/ 27 x 29 + 1/29 x 31 + ... + 1/ 73 x 75
3) C= 4/2 x4 +4/4 x 6 + 4/6 x 8 + ... + 4/ 2008 x 2010
tim so nguyen x biet 4-(27-30) = x (13-4)
Cau 1:
Tim x, biet: 1-4+7-10+.............-x=-75
Cau 2:
Cho x1, x2, x3, x4, x5 thuộc Z
Biết x1+ x2 + x3 + x4 + x5=0
và x1 + x2=x3+ x4= x4 + x5 =2
Tinh x3, x4 , x5
Cau 3: Tim x biet
(x+7+1) chia het cho (x+7)
Tim X
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) =
1) tim x biết:
a) (19.x +2.5^2) : 14=(13-8)^2 - 4^2
b) 2.3^x=10.3^12+8.27^4
2) so sanh
a) 5^23 va 6.5^22
b)21^15 va 27^5.49^8
c)3^39 va 11^21
d) 7.2^13 va 2^16
tim x , biet :
a, ( 19 × x + 2.52 ) : 14 = ( 13 - 8 )2
b, 2.3x = 10 . 312 + 8. 274
ha oi giup mik
1 ) tim x
A) (19x + 2 .52) : 14 = (13-8)2 - 42
B) 2 . 33 = 10 . 312 . 8 . 274
2) tim x thuoc N
a) 390 - ( x - 7 ) = 169 : 13
c) x - 6 : 2 - ( 48 - 24 ) : 2 : 6 - 3 = 0
d) x + 5 . 2 - ( 32 + 16 . 3 : 6 - 15 ) = 0