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2^5 x 3^5 × 4^2 / 12^2
= (2^5 x 3^5 x 4^2)/(4^2 x 3^2)
= 2^5 x 3^(5 - 2)
= 2^5 x 3^3
nomor 2
a. 2x^3.7x^4.(3x)^2 = (2.7.9)x^(3+4+2)
= 126x^9
b. y^5.(x.z)^3(1/x^2.y)
= y^5x^3z^3./(x^2y)
= y^4 xz^3
nomor 3
a. 2^x = 8
2^x = 2^3
x = 3
b. 4^x = 0,125
4^x = 1/8
2^2x = 2^-3
2x = - 3
x = - 3/2
c. (2/5)^x = 1
(2/5)^x = (2/5)^0
x = 0