So, I'm at work (Japanese public elementary school) and asked to borrow a 6th grade Social Studies textbook.
The last chapter covers the 'Long War' period as it's phrased in the book, 1931-1945.
My Japanese isn't great so I can't understand everything written contextually, but here's the exact Japanese text, the literal English translation, and my rough translation:
They explicitly acknowledge the army killed innocent women and children but don't go into detail about how, or how many. The last sentence gives the impression normal citizens didn't know of these events (implying a cover up by the army) but I've seen Japanese newspaper reports from that period about a beheading competition; so partially false.
Where have I heard that before?

Pretty much straightforwardly saying that the brutality had the opposite effect of what was intended and the strategy of the army was misguided and wrong.
The next paragraph is a caption to a picture of kneeling, presumably surrendered, Chinese soldiers with Japanese officers reviewing the group on horseback.
I'm going to assume 'ring was enlarged' probably refers to the Japanese sphere of influence. The picture itself is tame, just people with not even a weapon visible.
Evidently, the issue of Nanking is addressed as early as 6th grade in my city. These students are 12-13 years old so I do have to give some leniency not to include graphic descriptions of the slaughter. Tomorrow, I work at a junior high school so I'll try to get a hold of a 3rd (9th) grade history textbook to see if more accurate details of the transgressions are given in upper grades.