A maths book and five ____(notebook/notebooks).
Where is the boy buying a big house for his parents?
解比例
40∶0.5＝x∶1.2
x＝____
《资治通鉴》是我国一部编年体巨著，它因宋神宗对它的评价“鉴于往事，有资于治道”而命名，主持编写此书的是（ ）
