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简答题根据有效数字的运算规则进行计算:  (1)7.9936÷0.9967-5.02=?  (2)0.0325×5.103×60.06 ÷139.8=?  (3)(1.276×4.17)+1.7×10-4-(0.0021764×0.0121)=?  (4)pH=1.05,[H+]=?
  • (1)7.9936÷0.9967-5.02=7.994÷0.9967-5.02=8.02-5.02=3.00
    (2)0.0325×5.103×60.06÷139.8=0.0325×5.10×60.1÷140=0.0712
    (3)(1.276×4.17)+1.7×10-4-(0.0021764×0.0121)
    =(1.28×4.17)+1.7×10-4-(0.00218×0.0121)
    = 5.34+0+0
    =5.34
    (4)pH=1.05 ,[H+]=8.9×10-2
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