a)2x+2=5+x 2x-x=5-2 x=3
b)-3+2x=4-5x 2x+5x=4+3 7x=7 x=1
c)3x+3=-x-1 3x+x=-1-3 4x=-4 x=-1
d)2(x+1)=3(x-1) 2x+2=3x-3 2+3=3x-2x x=5
e)3(4x-5)=4x-(2x-4) 12x-15=4x-2x+4 12x-15=2x+4 12x-2x=4+15 10x=19 x=1.9
Ptriangle= 3(x-1) =3x-3
P Rectangle =(L+l) x 2 =(x+2.5) x 2 = 2x+5
2x+5= 3x-3 5+3=2x+3x 8=x
Traiangle rectangle GHF d'où GF²=GH²+HF²
HF²=GF²-GH²
GF²=45x45=2025
GH²= 27 x27=729
HF²= 2025-729
HF²=1296
HF=36
Triangle rectangle HFE d'où EF²=HE²+HF²
HE²=54 X54 =2916
EF²=2916+1296=4212
EF= 64.8
Aire ICAH = cote² CA²=81
Aire CDEB= cote² CB²= 45
Triangle rectangle ACB d'où
CA²=CB²+AB²
AB²=CA²-CB²
AB²=81-45 AB²=36
AB=6
