3a+2=b 3+2b=a求ab

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3a+2=b3+2b=a求ab3a+2=b3+2b=a求ab3a+2=b3+2b=a求ab3+2b=a3+2(3a+2)=a3+6a+4=a5a=-7a=-7/5b=3*-7/5+2=-21/5+2=

3a+2=b 3+2b=a求ab
3a+2=b 3+2b=a
求ab

3a+2=b 3+2b=a求ab
3+2b=a
3+2(3a+2)=a
3+6a+4=a
5a=-7
a=-7/5
b=3*-7/5+2=-21/5+2=-11/5
ab=-7/5*-11/5=77/25

b=3a+2代入a=3+2b
a=3+6a+4
5a=-7
a=-7/5

3a+2=b 1
3+2b=a 2
1式代入2式得
3+2(3a+2)=a
3+6a+4=a
5a=-7
a=-7/5
2式代入1式得
3(3+2b)+2=b
9+6b+2=b
5b=-11
b=-11/5

将a=2b+3代入3a+2=b得3(3+2b)+2=b
解得b=-11/5
再代入b=-11/5,求出a=-7/5
则ab=77/25