Exercice 1 :
1) donner sous la forme de a x 10^n :
A = (100x10^(-5)x10^8)/(1000x10^6x10^8)
A = 10^2/10^3 x 10^(-5)/10^6 x 10^8/10^8
A = 10^(2-3) x 10^(-5-6) x 1
A = 10^(-1) x 10^(-11) x 1
A = 10^(-1-11) x 1
A = 1 x 10^(-12)
B = (3^7x10^10x3^2)/(10^(-16)x1x3^2x3^6)
B = (3^(7+2) x 10^10)/(1x10^(-16)x3^(2+6))
B = 3^9 x 10^10 x 10^16 x 3^(-8)
B = 3^(9-8) x 10^(10+16)
B = 3 x 10^26
2) notation scientifique :
C = (1600000 x 0,002)^2/(10^5 x 1,5)
C = 16^2x(10^5)^2x2^2x(10^-3)^2x10^(-5)/1,5
C = 16^2 x 10^10 x2^2 x10^6x10^(-5) / 1,5
C = (16x2)^2 x 10^(10+6-5) / 1,5
C = 32^2 x 10^11 / 1,5
C = 682.10^11
D = 1425 x 10^6 x (5 - 3 x 2)^2
D = 1425 x 10^6 x (-1)^2
D = 1425.10^6
