计算3.14×67+8.2×31.4﹣90×0.31412.65÷12.5÷0.8 (32×0.63×0.95)÷(1.6×21×1.9)
计算:
计算:(1998+19981998+199819981998+…)÷(1999+19991999+199919991999…)×1999
计算(1) (2)