a)4^x×2^4=(2^4)^5
(2^2)^x×2^4=2^20
2x+4=200
2x=16
x=8
b)(3^2)^2x×3^5=(3^3)^3
3^4x×3^5=3^9
4x+5=9
x=1
c )(5^3)^x×(5^2)^4=5^14
5^3x×5^8=5^14
3x+8=14
3x=6
x=200x
d)[(2^3)^x×(2^2)^3]^2÷(2^4)^3=2^6
(2^3x×2^6)^2÷2^12=2^6
(2^3x+6)^2÷2^12=2^6
2^6x+12÷2^12=2^6x
6x+12-12=6
6x=6
x=1