Sagot :
N°17
A = 0.3*5/4 *10-1/10-4
A = 0.375 * 10^3
A = 3.75*10
B = 49*6/14*10^-7/10^-2
B = 21 * 10^-5
B = 2.1 *10^-4
C = 5*7/2*10^3/10^7
C = 17.5 * 10^3/10^7
C = 17.5 * 10^-4
C = 1.75*10^-3
D = 21*16/12*10^4/10²
D = 28 * 10^4/10²
D = 28*10²
D = 2.8*10
N°18
A = 3*1.2/0.2*10²*10^-12/10^-7
A = 18 * 10^-10/10^-7
A = 18 * 10^-3
A= 1.8*10^-2
B = 7*5/14*10^8/10^6
B = 2.5*10²
C = 12/8*10²*10^-6/10^-3
C = 1.5 *10^-4/10^-3
C = 1.5*10^-3
D = (-2)*25/50*(-0.1)*10^-3*10^4/10²
D = -50/-5*10/10²
D = 10*10^4
D = 1*10^5
ouf!