式11: "f" left parenthesis, "x" , right parenthesis equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesis plus "B" Subscript, 2 , Baselinefx=m1x−B1+B2
11
式12: "g" left parenthesis, "x" , right parenthesis equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesis plus "B" Subscript, 2 , Baselinegx=m2x−B1+B2
12
式13: "h" left parenthesis, "x" , right parenthesis equals "A" Subscript, 2 , Baselinehx=A2
13
式14: "g" left parenthesis, "C" Subscript, 1 , Baseline , right parenthesis tilde "h" left parenthesis, "C" Subscript, 1 , Baseline , right parenthesisgC1~hC1
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式15: "C" Subscript, 2 , Baseline equals "h" left parenthesis, "C" Subscript, 1 , Baseline , right parenthesisC2=hC1
equals=
00
15
式16: "f" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesis tilde "h" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesisfD1~hD1
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式17: "D" Subscript, 2 , Baseline equals "h" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesisD2=hD1
equals=
00
17
Graphs
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18
式19: polygon left parenthesis, "B" , "D" , right parenthesispolygonB,D
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式20: polygon left parenthesis, "A" , "B" , "C" , right parenthesispolygonA,B,C
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Points
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21
35
提供：
提供：
A
B
C
D
a
b
75°
45°
15°
Start black, StartFraction, "a" Over "b" , EndFraction equals 2 End blackab=2
