5题英文数学题!今天要!1.In the coordinate plane,A=(6,0)and B=(3,4).Fin

5题英文数学题!今天要!
1.In the coordinate plane,A=(6,0)and B=(3,4).Find the area of triangle OAB where O is the origin.[Hint:The height of the triangle is the diatance of B from the x-axis.]
2.In which two consecutive months is the difference between the average temperatures greatest?What is the difference?
3.Suggest two fractions with different denominators but the same numerators such that their difference is 5/12.
4.A wire is first bent into a square of 9 cm.It is then bent into a rectangle with an area greater than 70 cm2.Find two possible dimensions of the rectangle.
5.The base and the height of a triangular metal plate are 8 cm and 4 cm respectively.The metal plate is melted recast into a metal place in he shape of a trapezium with a height the same as that of the triangle.Find two possible pairs of the lengths of the shorter base and the longer base of the new metal plate.[Hint:The thickness of metal plates can be ignored.]
(如有不会..可以打解释``就是翻译!)