帮忙处理数学题。。(速度。。)
连问两次。。1.{(7又1/13+2.4÷6又2/5)+2又5/8}x52.{(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10...
连问两次。。
1.{(7又1/13+2.4÷6又2/5)+2又5/8}x5
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
3. 1/(4x7)+1/(7x10)。。。+1/(100x103)
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
7. 9999x2222+3333x3334
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)
等待中。。。。 展开
1.{(7又1/13+2.4÷6又2/5)+2又5/8}x5
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
3. 1/(4x7)+1/(7x10)。。。+1/(100x103)
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
7. 9999x2222+3333x3334
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)
等待中。。。。 展开
7个回答
2012-08-15 · 知道合伙人教育行家
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1.{(7又1/13+2.4÷6又2/5)+2又5/8}x5
={92/13+24/10÷32/5)+21/8}x5
={92/13+24/10x5/32)+21/8}x5
={92/13+3/8+21/8}x5
={92/13+4}x5
={92/13+52/13}x5
=(144/13)x5
=720/13
=55又5/13.
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
={(43/4-59/12)x29/11}÷{(9/8+1/12)÷(9/4÷120/11)}
={(129/12-59/12)x29/11}÷{(27/24+2/24)÷(9/4x11/120)}
={61/12x29/11}÷{29/24÷99/480}
=(1769/132)÷{29/24x480/99}
=(1769/132)÷(580/99)
=(1769/132)x(99/580)
=2.2875.
3. 由1/(4x7)=[(1/4)-(1/7)]/3
1/(7x10)=[(1/7)-(1/10)]/3
......
1/(100x103)=[(1/100)-(1/103)]/3
得1/(4x7)+1/(7x10)。。。+1/(100x103)
=[(1/4)-(1/103)]/3
=33/413.
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=1-5x(1/2-1/3)+7x(1/3-1/4)-9x(1/4-1/5)+11x(1/5-1/6)-13x(1/6-1/7)+15x(1/7-1/8)-17x(1/8-1/9)+19x(1/9-1/10)
=-4.
5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
=[46+43+41+...+1)-(1/7)*]/8
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
=(1+3+5+7+9+11+13+15+17)+[1/(2x3)+1/(3x4)+...+1/(9x10)]
=136+[(1/2-1/3)+(1/3-1/4)+....+(1/9-1/10)]
=136+[1/2-1/10]
=136又2/5.
7. 9999x2222+3333x3334
=1111x9x1111x2+1111x3x(1111x3+1)
=1111x1111x(18+9)+1111x3
=1111x1111x30
=37029630.
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)
=1又51/74.
={92/13+24/10÷32/5)+21/8}x5
={92/13+24/10x5/32)+21/8}x5
={92/13+3/8+21/8}x5
={92/13+4}x5
={92/13+52/13}x5
=(144/13)x5
=720/13
=55又5/13.
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
={(43/4-59/12)x29/11}÷{(9/8+1/12)÷(9/4÷120/11)}
={(129/12-59/12)x29/11}÷{(27/24+2/24)÷(9/4x11/120)}
={61/12x29/11}÷{29/24÷99/480}
=(1769/132)÷{29/24x480/99}
=(1769/132)÷(580/99)
=(1769/132)x(99/580)
=2.2875.
3. 由1/(4x7)=[(1/4)-(1/7)]/3
1/(7x10)=[(1/7)-(1/10)]/3
......
1/(100x103)=[(1/100)-(1/103)]/3
得1/(4x7)+1/(7x10)。。。+1/(100x103)
=[(1/4)-(1/103)]/3
=33/413.
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=1-5x(1/2-1/3)+7x(1/3-1/4)-9x(1/4-1/5)+11x(1/5-1/6)-13x(1/6-1/7)+15x(1/7-1/8)-17x(1/8-1/9)+19x(1/9-1/10)
=-4.
5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
=[46+43+41+...+1)-(1/7)*]/8
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
=(1+3+5+7+9+11+13+15+17)+[1/(2x3)+1/(3x4)+...+1/(9x10)]
=136+[(1/2-1/3)+(1/3-1/4)+....+(1/9-1/10)]
=136+[1/2-1/10]
=136又2/5.
7. 9999x2222+3333x3334
=1111x9x1111x2+1111x3x(1111x3+1)
=1111x1111x(18+9)+1111x3
=1111x1111x30
=37029630.
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)
=1又51/74.
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题目这么多 还有带分数 够麻烦
1、原式=[(92/13)+2.4/(32/5)]x5
=[(92/13)+(3/8)]x5
=[(736+39)/104]x5
=(775/104)x5
=5738/104
数字有点大,但你的题目数字也不小
2、{(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
=
1、原式=[(92/13)+2.4/(32/5)]x5
=[(92/13)+(3/8)]x5
=[(736+39)/104]x5
=(775/104)x5
=5738/104
数字有点大,但你的题目数字也不小
2、{(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
=
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1:655/13 2:8/21`
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3. 1/(4x7)+1/(7x10)。。。+1/(100x103)
=1/3(1/4-1/7)+1/3(1/7-1/10)+……+1/3(1/100-1/103)
=1/3(1/4-1/7+1/7-1/10+……+1/100-1/103)
=1/3(1/4-1/103)
=……
7. 9999×2222+3333×3334
=3333×3×2222+3333×3334
=3333×6666+3333×3334
=3333(6666+3334)
=3333×10000
=33330000
=1/3(1/4-1/7)+1/3(1/7-1/10)+……+1/3(1/100-1/103)
=1/3(1/4-1/7+1/7-1/10+……+1/100-1/103)
=1/3(1/4-1/103)
=……
7. 9999×2222+3333×3334
=3333×3×2222+3333×3334
=3333×6666+3333×3334
=3333(6666+3334)
=3333×10000
=33330000
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1.{(7又1/13+2.4÷6又2/5)+2又5/8}x5=.{(7又1/13+2.4÷32/5)+2又5/8}x5
=.{7又1/13+3/8+2又5/8}x5=.10又1/13x5=.50又5/13
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
={(5又5/6)x29/11}÷{(53/24)÷(33/160)}=35/6*29/11*99/1060=609/424
3. 1/(4x7)+1/(7x10)。。。+1/(100x103 =1/4-1/7+1/7-1/10+。。。+1/100-1/103
=1/4-1/103=99/412
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10=1-1/2+1/10=3/5
. 5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
此题规律没看到 -1/7)*1/8是相同的,但46 43 41 没规律
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
=(1+3+5+7+9+11+13+15+17)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)=(1+17)*9/2+(1/2-1/10)=81又2/5
7. 9999x2222+3333x3334=1111*1111*(9*2+3*3)+3333=1234321*(27)+3333=33330000
或9999*2*1111+3333*3*1111+3333=9999*1111(2+1)+3333=9999*3333+3333=10000*3333=33330000
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)=.(1/4+23/18÷23/3)÷(9/2-37/40)
=(1/4+1/6)÷(143/40)=50/429
没想到 费我这么长时间
=.{7又1/13+3/8+2又5/8}x5=.10又1/13x5=.50又5/13
2. {(10.75-4又11/12)x2又7/11}÷{(1.125+1/12)÷(2.25÷10又10/11)}
={(5又5/6)x29/11}÷{(53/24)÷(33/160)}=35/6*29/11*99/1060=609/424
3. 1/(4x7)+1/(7x10)。。。+1/(100x103 =1/4-1/7+1/7-1/10+。。。+1/100-1/103
=1/4-1/103=99/412
4. 1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10=1-1/2+1/10=3/5
. 5.(46-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
此题规律没看到 -1/7)*1/8是相同的,但46 43 41 没规律
6. 1+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42+13又1/56+15又1/72+17又1/90
=(1+3+5+7+9+11+13+15+17)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)=(1+17)*9/2+(1/2-1/10)=81又2/5
7. 9999x2222+3333x3334=1111*1111*(9*2+3*3)+3333=1234321*(27)+3333=33330000
或9999*2*1111+3333*3*1111+3333=9999*1111(2+1)+3333=9999*3333+3333=10000*3333=33330000
8.(0.25+1又5/18÷7又2/3)÷(4又1/2-0.925)=.(1/4+23/18÷23/3)÷(9/2-37/40)
=(1/4+1/6)÷(143/40)=50/429
没想到 费我这么长时间
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1.655/13
2.21/8
3.33/412
4.3/5
5.算式错了应该是(45-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
=460/7
6.407/5
7.33330000
8.50/429
希望能帮到你,不懂可以问,欢迎采纳,谢谢诶!!!
2.21/8
3.33/412
4.3/5
5.算式错了应该是(45-1/7)x1/8+(43-1/7)x1/8+(41-1/7)x1/8+。。。+(1-1/7)x1/8
=460/7
6.407/5
7.33330000
8.50/429
希望能帮到你,不懂可以问,欢迎采纳,谢谢诶!!!
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