解方程3a+3d=18,a(a+d)(a+2d)=66

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解方程3a+3d=18,a(a+d)(a+2d)=66解方程3a+3d=18,a(a+d)(a+2d)=66解方程3a+3d=18,a(a+d)(a+2d)=66a+d=6a(a+2d)=11(6-d

解方程3a+3d=18,a(a+d)(a+2d)=66
解方程3a+3d=18,a(a+d)(a+2d)=66

解方程3a+3d=18,a(a+d)(a+2d)=66
a+d=6
a(a+2d)=11
(6-d)(6+d)=11
解得,d=±5
(1)d=5,得到a=1
(2)d=-5,得到a=11