简便计算过程方法解：71+69+73+70+68=70+（1+69）+70+70+68+3=70+70+70+70+68+2+1=70+70+70+70+70+1=70×5+1=350+1=351
71十69）十（72十68）十1十70=140+140+71=280+71=351
71+69+73+70+68简便计算？71+69+73+70+68=70*5+1-1+3-2=351
