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0.35时=()分,和5.36时=()分,123.123x124-124.124x123这道简算怎麽算,知道得人快告诉我

题目详情
0.35时=()分,和5.36时=()分,123.123x124-124.124x123这道简算怎麽算,知道得人快告诉我
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答案和解析
0.35时=(21)分,5.36时=(321.6)分,
123.123x124-124.124x123
=123×124+0.123×124-124×123-0.124×123
=0.123×124-0.124×123
=0.123×(124-124)
=0