第10题:
问答题
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+]=?
正确答案:
(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
解析:
暂无解析