A simple calculation of the second volume of the fourth grade mathematics in Wentong Primary School (2+4+6+8 ``````````+98+1+3+5+7 ````````````````````````. 2-1+4-3+6-5+8-7 ``````````` = 50. Thank you! Comments |0mie in the distance | Level 4 adoption rate is 40%. Good at: default sorting of education/science | The other eight answers are sorted by time. Nine minutes ago 1 105464853| Level 4 (2+4+6+8 ...+98+100)-(65438)
=2+4+6+8……+98+ 100- 1-3-5-7……-99
=(2- 1)+(4-3)+(6-5)+(8-7)……+( 100-99)
= 1+ 1+ 1+ 1……+ 1
=50 comments |05 minutes ago, Linger Yi Xue Month | 2 (2+4+6+8 ...+98+100)-(1+3+5+7 ...+99).
=2+4+6+8……+98+ 100- 1-3-5-7……-99
=(2- 1)+(4-3)+(6-5)+(8-7)……+( 100-99)
= 1+ 1+ 1+ 1……+ 1
=50 comments |0 report | 17 minutes ago | I learned from my mobile phone | Level 1 (2468 ... 98100)-(1357 ... 97 99)
=(2 100)*(50/2)-( 1 99)*(50/2)
= 102*25- 100*25
=( 102- 100)*25
=2*25
=50 comments | 0See more other answers.
Share to: Death axx three-level continuous 1 day reissue card. Did you finish the task today? All tasks: primary school graduation exam+100 rookie training+10 thriving+100 persistent access to the personal center.
Help | Feedback Suggestions | Complaints | Baidu knows the free code
20 13 Baidu must read Baidu before using it | Know the agreement | Baidu knows the open platform.