=a2-b2 2=a2+2ab+b2 2=a2-2ab+b2
3=a3+3a2b+3ab2+b3 3=a3-3a2b+3ab2-b3
一元二次方程ax2+bx+c=0的解x?,?=/2a
Simple Interest:利息Interest=本金Principal?时间Time?利率Rate。
Compound Interest:A=n;A为本利和,P为本金,R为利率,n为期数。
Discount=Cost?Rate of Discount Distance=Speed?Time
Pythagorean Theorem:直角三角形两直角边的平方和等于斜边 的平方。
多变形的内角和:180,总对角线数为n/2条,从每一个顶点引出的对角线数为条;式中:n为多边形的边数
平面直角坐标系中,A和B是任意两点,C是线段AB的中点,则x=/2,,y=/2,线段AB两端点间的距离=
平面图形的周长和面积:
Perimeter Area
Triangle 三边之和 /2
Square 边长4 边长的平方
Rectangle 2 长宽
Parallelogram 2 底高
Trapezoid 四边之和 高/2
Rhombus 边长4 两条对角线之积的1/2
Circle 2d r2
立体图形的表面积和体积:
Volume Surface Area
Rectangular Prism 长宽高 2
Cube 棱长的立方 6棱长棱长
Right Circular Cylinder r2h 2r h+2r2
Sphere 4r3/3 4r2
Right Circular Cone r2h/3 lr/2
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