数学题,六年级(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8……+(1-1/8)*1/8=?
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1.
(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8……+(1-1/8)*1/8
= 1/8*(49-1/8+46-1/8+43-1/8+……+1-1/8)
=1/8*[(49+46+43+……+1)-17*1/8]
=1/8*(425-17/8)下面知道了吧?!
2.
2*3+4*6+6*9+8*12+……202*303/1*2+2*4+3*6+4*8……101*202= 3
原因是2*3+4*6+6*9+8*12+……202*303
=1*2*3+2*4*3+3*6*3+4*8*3……101*202*3
=3(1*2+2*4+3*6+4*8……101*202)
3.
39*148/149+148*86/149+48*74/149
= (39*148+148*86)/149+48*74/149
=125*148/149+48*74/149
4.
29又1/2*2/3+39又1/3*3/4+49又1/4*4/5+59又1/5*5/6
=29又1/3+39又1/4+49又1/5+59又1/6
=(29+39+49+59)+(1/3+1/4+1/5+1/6)
=176又19/20,4,hi.baidu/talenty/blog/item/cd5db035658c738da61e1284,2,gfhgf,1,100
200
300
400,1,(1)=1/8*(49-1/8+46-1/8+43-1/8+......+1-1/8)=1/8*(400-2)=50-1/4=49+3/4
=49.75
(2)=(202/3)/(101/2)=4/3
(3)=1/149*(39*148+86*148+148*74)=1/149*199*148=199-199/149
=197+99/149
(4)=29*2/3+39*3/4+49*4/5+59*5/6+1/3+1/4+1/5+1/6
=,0,数学题,六年级
(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8……+(1-1/8)*1/8=
2*3+4*6+6*9+8*12+……202*303/1*2+2*4+3*6+4*8……101*202=
39*148/149+148*86/149+48*74/149=
29又1/2*2/3+39又1/3*3/4+49又1/4*4/5+59又1/5*5/6=
简便,过程!!!!!!!!!!!!
(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8……+(1-1/8)*1/8
= 1/8*(49-1/8+46-1/8+43-1/8+……+1-1/8)
=1/8*[(49+46+43+……+1)-17*1/8]
=1/8*(425-17/8)下面知道了吧?!
2.
2*3+4*6+6*9+8*12+……202*303/1*2+2*4+3*6+4*8……101*202= 3
原因是2*3+4*6+6*9+8*12+……202*303
=1*2*3+2*4*3+3*6*3+4*8*3……101*202*3
=3(1*2+2*4+3*6+4*8……101*202)
3.
39*148/149+148*86/149+48*74/149
= (39*148+148*86)/149+48*74/149
=125*148/149+48*74/149
4.
29又1/2*2/3+39又1/3*3/4+49又1/4*4/5+59又1/5*5/6
=29又1/3+39又1/4+49又1/5+59又1/6
=(29+39+49+59)+(1/3+1/4+1/5+1/6)
=176又19/20,4,hi.baidu/talenty/blog/item/cd5db035658c738da61e1284,2,gfhgf,1,100
200
300
400,1,(1)=1/8*(49-1/8+46-1/8+43-1/8+......+1-1/8)=1/8*(400-2)=50-1/4=49+3/4
=49.75
(2)=(202/3)/(101/2)=4/3
(3)=1/149*(39*148+86*148+148*74)=1/149*199*148=199-199/149
=197+99/149
(4)=29*2/3+39*3/4+49*4/5+59*5/6+1/3+1/4+1/5+1/6
=,0,数学题,六年级
(49-1/8)*1/8+(46-1/8)*1/8+(43-1/8)*1/8……+(1-1/8)*1/8=
2*3+4*6+6*9+8*12+……202*303/1*2+2*4+3*6+4*8……101*202=
39*148/149+148*86/149+48*74/149=
29又1/2*2/3+39又1/3*3/4+49又1/4*4/5+59又1/5*5/6=
简便,过程!!!!!!!!!!!!
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