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01.1/20+1/30+1/42+1/56+1/72+1/90这题该如何做
1/20+1/30+1/42+1/56+1/72+1/90=1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10=1/4-1/5+1/5-1/6+...+1/9-1/10=1/4-1/10=3/20...查看完整版>>1/20+1/30+1/42+1/56+1/72+1/90这题该如何做02.1/22+1/30+1/42+1/56+1/72+1/90=?简便方法是什么?
1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90= 1/(4*5) + 1/(5*6) + 1/(6*7) + 1/(7*8) + 1/(8*9) + 1/(9*10)= (1/4 - 1/5) + (1/5 - 1/6) + .... + (1/9 - 1/10)= 1/4 - 1/10= 0.15...查看完整版>>1/22+1/30+1/42+1/56+1/72+1/90=?简便方法是什么?03.1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
(1/6=1/( 2)-1/(3 ) 1/12=1/( 3)-1/( 4) 1/20=1/( 4)-1/( 5)......)...查看完整版>>1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/9004.1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?要用简便方法做哦
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 =1-1/2+1/2-1/3+1/3-1/4+……＋1/8-1/9 ＝1-1/9 ＝8/9...查看完整版>>1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?要用简便方法做哦05.1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=1-1/2+1/2-1/3+1/3-1/4+……＋1/8-1/9＝1-1/9＝8/9...查看完整版>>1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?06.怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”
=1/2+(1/2-1/3)+(1/3-1/4)+……+（1/7-1/8）=1-1/8=7/8...查看完整版>>怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”07.怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”
1/2+1/6+1/12+1/20+1/30+1/42+1/56=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)=1-1/8=7/8...查看完整版>>怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”08.怎样用简便方法计算(1/56+1/72+1/90)×70
= (1/7*8 + 1/8*9 + 1/9*10) * 70= (1/7 - 1/8 + 1/8 - 1/9 + 1/9 - 1/10) * 70= (1/7 - 1/10) * 70= 10 - 7= 3...查看完整版>>怎样用简便方法计算(1/56+1/72+1/90)×7009.计算1/2 +1/6+1/12+1/20+1/30+1/42=
1/2 +1/6+1/12+1/20+1/30+1/42=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)=1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7(∵-1/2+1/2=0……抵消)=1-1/7=6/7...查看完整版>>计算1/2 +1/6+1/12+1/20+1/30+1/42=10.1525*1040的照片如何改成110*90
用acdsee或者其他图片软件编辑...查看完整版>>1525*1040的照片如何改成110*90

 

 

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