(1)(111+999)÷[56×(﹣)](2)200.5×10%+2.005×490+0.2005×5000(3)3333×3333+9999×8889(4)+++…+(5)若3.5×[6.8﹣(1.6+△÷0.9)÷8.4=0.5,求△的值.