计算7x0G4U
（1+2+3+……+2009+2010+……+2+1）÷20107x0G4U
算式：提示'm;T/k.n.r'J5X+Z;v(\7x0G4U
=-[5S9k,y/Q6_8o1}+k5X0u1W+_7x0G4U