A -- launch a satellite
B -- launch pad
C -- multistage rocket
D -- orbit
E -- artificial satellite
F -- solar cell
G -- spacecraft
H -- lunar module
I -- landing pad
J -- set’vice module
K -- directional antenna
L -- command module
M -- astronaut
N -- space suit
P -- life support system
A -- launch a satellite
B -- launch pad
C -- multistage rocket
D -- orbit
E -- artificial satellite
F -- solar cell
G -- spacecraft
H -- lunar module
I -- landing pad
J -- set’vice module
K -- directional antenna
L -- command module
M -- astronaut
N -- space suit
P -- life support system
M+N=4abC.()
(1)M=a(b+c-a)2+b(c+a-6)2+c(a+b-c)2
(2)N=(b+c-a)(c+a-b)(a+b-c)
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