2.in triangle ABC , AB=7cm,BC=9cm and AC=ycm,where y is an positive integer.Find the greastest possible value of y.
3.In the first term,the ratio of the numbers of boys to girls in F3 is 3:2.If the number of girls is decreased by 18% and that of the boys is increased by 14% in the second term,what is the percentage change in the number of students in F.3?
更新1:
要步驟!!!!!!!!!!!!!!!