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重心坐标为 C(325×1500+(400×250)+(450×450)+(350×350)+(25×450 1500+250+450+350+450 923750 =3079 3000 (75×1500)+(150×250)+(350×450)+(400×350)+(450×450 1500+250+450+350+450 650000 216.7 3000重心坐标为： 307.9 3000 923750 1500 250 450 350 450 (325 1500) (400 250) (450 450) (350 350) (25 450) = = + + + + + + + + = cx 216.7 3000 650000 1500 250 450 350 450 (75 1500) (150 250) (350 450) (400 350) (450 450) = = + + + + + + + + c =y