题目内容：

几道不懂的题
97x2000-96x2001=
(999x999+999)x100=
9876x9876-9875x9877=
3333.3x12340-111110x370.2=
（0.1x0.1+0.2x0.2+0.3x0.3+0.4x0.4)的平方除以(0.1x0.1x0.1+0.2x0.2x0.2+0.3x0.3x0.3+0.4x0.4x0.4)的立方