英语和数学好的来帮忙做一下这些数学题,翻译下,告诉下方法和答案。不知道方法答案的只帮我翻译一下也可以
A game of chance consists of rolling a disc of diameter(半径) 2cm on a horizontal square board. The board is divided into 25 small squares of side 4cm.A player wins a prize if,when a disc settles,it lies entirely within the centre small square.There is a ridge round the outside edge of the board so that the disc always bounces back,cannot fall off and lies entirely within the boundary of the large square .What is the probability(概率)of winning the prize
Three successive transformations A,B,C are applied to points in the coordinate system(坐标系)First A maps (x,y)into(x-y,x+2y);then B maps (x,y)into(-2x,y-3x);finally C maps (x,y) into(x+2y,-x-5y).Then the image of the line y-2x-1=0 under these three successive transformations is a line of the form y=mx+b.What is the value of m?
The sum of the series2/3+3/3*3+4/3*3*3......is?