这题怎么做?要有详细的解题过程。
6个回答
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=8+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)=8+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=8+1/2-1/10=8(2/5)
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=1+1/2*3+1+1/3*4+…+1+1/9*10
=8+1/2-1/3+1/3-1/4+…+1/9-1/10
=8+1/2-1/10
=8+4/10
=8又2/5
=8+1/2-1/3+1/3-1/4+…+1/9-1/10
=8+1/2-1/10
=8+4/10
=8又2/5
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7/6+13/12+21/20+31/30+43/42+57/56+73/72+91/90
=(1+1/6)+(1+1/12)+(1+1/20)+(1+1/30)+(1+1/42)+(1+1/56)+(1+1/72)+(1+1/90)
=8+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=8+(1/4+1/20+1/30+1/42+1/56+1/72+1/90)
=8+(3/10+1/30+1/42+1/56+1/72+1/90)
=8+(1/3+1/42+1/56+1/72+1/90)
=8+(1/3+(8×9×10)/(6×7×8×9×10)+(6×9×10)/(6×7×8×9×10)+(6×7×10)/(6×7×8×9×10)+(6×7×8)/(6×7×8×9×10))
=8+(1/3+(720+540+420+336)/30240)
=8+(1/3+1/15)
=8又2/5
=(1+1/6)+(1+1/12)+(1+1/20)+(1+1/30)+(1+1/42)+(1+1/56)+(1+1/72)+(1+1/90)
=8+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=8+(1/4+1/20+1/30+1/42+1/56+1/72+1/90)
=8+(3/10+1/30+1/42+1/56+1/72+1/90)
=8+(1/3+1/42+1/56+1/72+1/90)
=8+(1/3+(8×9×10)/(6×7×8×9×10)+(6×9×10)/(6×7×8×9×10)+(6×7×10)/(6×7×8×9×10)+(6×7×8)/(6×7×8×9×10))
=8+(1/3+(720+540+420+336)/30240)
=8+(1/3+1/15)
=8又2/5
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