Overview: 7 questions will be solved this time.Among them
           ☆1 arithmetic calculations
           ☆6 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 222222222222×555555555555
    Solution:
    222222222222×555555555555 = 123456790123209876543210
    Column vertical calculation:

																	2	2	2	2	2	2	2	2	2	2	2	2
✖																	5	5	5	5	5	5	5	5	5	5	5	5
																1	1	1	1	1	1	1	1	1	1	1	1	0
															1	1	1	1	1	1	1	1	1	1	1	1	0
														1	1	1	1	1	1	1	1	1	1	1	1	0
													1	1	1	1	1	1	1	1	1	1	1	1	0
												1	1	1	1	1	1	1	1	1	1	1	1	0
											1	1	1	1	1	1	1	1	1	1	1	1	0
										1	1	1	1	1	1	1	1	1	1	1	1	0
									1	1	1	1	1	1	1	1	1	1	1	1	0
								1	1	1	1	1	1	1	1	1	1	1	1	0
							1	1	1	1	1	1	1	1	1	1	1	1	0
						1	1	1	1	1	1	1	1	1	1	1	1	0
					1	1	1	1	1	1	1	1	1	1	1	1	0
					1	2	3	4	5	6	7	9	0	1	2	3	2	0	9	8	7	6	5	4	3	2	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 333333333333×888888888888
    Solution:
    333333333333×888888888888 = 296296296295703703703704
    Column vertical calculation:

																	3	3	3	3	3	3	3	3	3	3	3	3
✖																	8	8	8	8	8	8	8	8	8	8	8	8
																2	6	6	6	6	6	6	6	6	6	6	6	4
															2	6	6	6	6	6	6	6	6	6	6	6	4
														2	6	6	6	6	6	6	6	6	6	6	6	4
													2	6	6	6	6	6	6	6	6	6	6	6	4
												2	6	6	6	6	6	6	6	6	6	6	6	4
											2	6	6	6	6	6	6	6	6	6	6	6	4
										2	6	6	6	6	6	6	6	6	6	6	6	4
									2	6	6	6	6	6	6	6	6	6	6	6	4
								2	6	6	6	6	6	6	6	6	6	6	6	4
							2	6	6	6	6	6	6	6	6	6	6	6	4
						2	6	6	6	6	6	6	6	6	6	6	6	4
					2	6	6	6	6	6	6	6	6	6	6	6	4
					2	9	6	2	9	6	2	9	6	2	9	5	7	0	3	7	0	3	7	0	3	7	0	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12345679012345679×81
    Solution:
    12345679012345679×81 = 999999999999999999
    Column vertical calculation:

							1	2	3	4	5	6	7	9	0	1	2	3	4	5	6	7	9
✖																						8	1
							1	2	3	4	5	6	7	9	0	1	2	3	4	5	6	7	9
						9	8	7	6	5	4	3	2	0	9	8	7	6	5	4	3	2
						9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 333333333333333×59049
    Solution:
    333333333333333×59049 = 19682999999999980317
    Column vertical calculation:

										3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
✖																				5	9	0	4	9
									2	9	9	9	9	9	9	9	9	9	9	9	9	9	9	7
								1	3	3	3	3	3	3	3	3	3	3	3	3	3	3	2
								0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
						2	9	9	9	9	9	9	9	9	9	9	9	9	9	9	7
					1	6	6	6	6	6	6	6	6	6	6	6	6	6	6	5
					1	9	6	8	2	9	9	9	9	9	9	9	9	9	9	8	0	3	1	7

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 200000000002×300000000001
    Solution:
    200000000002×300000000001 = 60000000000800000000002
    Column vertical calculation:

																	2	0	0	0	0	0	0	0	0	0	0	2
✖																	3	0	0	0	0	0	0	0	0	0	0	1
																	2	0	0	0	0	0	0	0	0	0	0	2
																0	0	0	0	0	0	0	0	0	0	0	0
															0	0	0	0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0	0	0	0
									0	0	0	0	0	0	0	0	0	0	0	0
								0	0	0	0	0	0	0	0	0	0	0	0
							0	0	0	0	0	0	0	0	0	0	0	0
						6	0	0	0	0	0	0	0	0	0	0	6
						6	0	0	0	0	0	0	0	0	0	0	8	0	0	0	0	0	0	0	0	0	0	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 500000000017×800000000013
    Solution:
    500000000017×800000000013 = 400000000020100000000221
    Column vertical calculation:

																	5	0	0	0	0	0	0	0	0	0	1	7
✖																	8	0	0	0	0	0	0	0	0	0	1	3
																1	5	0	0	0	0	0	0	0	0	0	5	1
																5	0	0	0	0	0	0	0	0	0	1	7
															0	0	0	0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0	0	0	0
									0	0	0	0	0	0	0	0	0	0	0	0
								0	0	0	0	0	0	0	0	0	0	0	0
							0	0	0	0	0	0	0	0	0	0	0	0
					4	0	0	0	0	0	0	0	0	0	1	3	6
					4	0	0	0	0	0	0	0	0	0	2	0	1	0	0	0	0	0	0	0	0	2	2	1

[7/7 Formula]
    Work: Calculate the value of equation 25+275+2775+27775+277775+2777775+27777775 .
    Question type: Mathematical calculation
    Solution:
          25+275+2775+27775+277775+2777775+27777775
        =300+2775+27775+277775+2777775+27777775
        =3075+27775+277775+2777775+27777775
        =30850+277775+2777775+27777775
        =308625+2777775+27777775
        =3086400+27777775
        =30864175
    Answer:25+275+2775+27775+277775+2777775+27777775=30864175

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>>注：本次最多计算 7 道题。

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