urgent svp il mfaut les reponse

1)A=4,16x10^-4
B=3,13x10^3
C=10^6
D=10^27

2)B=7x10^5x8x10^-8/5x10^-4
=56x10^-3/5x10^-4
=0,06/0,0005
=120

scientifaique 1,2x10^2

4) A=(14/6-3/9)X-3/4
=(42/18-6/18)X-3/4
=36/18X-3/4
=-108/72
=-3/2

B=-11/15-3/25X35/9
=-11/15-105/225
=-11/15-7/15
=-18/15
=-6/5

C=2-5/2:15/4
=2-5/2X4/15
=2-20/30
=60/30-20/30
=40/30
=4/3

3)C=7X(7^-2)^-4/7^11
=7x-0,08/7^11
=-0,57/7^11