Tìm x

1) 75 x x = 1800
4)
1) 76502 x= 10512:32
)
x264 = 1456:52
b) 1855 x = 35
:
c) x: 204 = 543
x + 532 = 48 x 23
256 - (x + 61) 82
I
1