tìm x \(\in\)N
1, \(x^2.x^3=3^7:3^2\)
2, \(x-18:3=12\)
3,\(\left(x-18\right):2=12\)
4,\(x^2=16\)
5,\(\left(2x+2^4\right).5^3\)
6,\(\left(3x-48\right).6=3^3.2^2+2^2.3^2=12^2\)
7,\(1170:\left(x-13\right)=339-3.10^2\)
8,\(\left(x-1\right).11=33\)
9,\(3.\left(x-9\right)+15=12+243:3^2\)
10,\(30:\left(x-7\right)=15^9:15^8\)
1, x^2 . x^3 = 3^7 : 3^2
x^5 = 3^5
=> x = 3
2, x - 18 : 3 = 12
x - 6 = 12
x = 12 + 6
x = 18
3, (x - 18) : 2 = 12
x - 18 = 12 . 2
x - 18 = 24
x = 24 + 18
x = 42
4, x^2 = 16
x^2 = 4^2
=> x = 4
x=4 nha bn
k k nha
mk k lại cho!