(197+151+158+92+169+213+266)除以7=?
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(197+151+158+92+169+213+266)除以7=?
(197+151+158+92+169+213+266)除以7
=【(197+213)+(158+92)+(151+169)+266】÷7
=【410+250+320+266】÷7
=1246÷7
=178
178?
1246/7=178
(197+151+158+92+169+213+266)除以7=177.71428571428571428571428571429