5/4-9/20+11/30-13/42+15/56-17/72+19/90=
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![5/4-9/20+11/30-13/42+15/56-17/72+19/90=](/uploads/image/z/6631-7-1.jpg?t=5%2F4-9%2F20%2B11%2F30-13%2F42%2B15%2F56-17%2F72%2B19%2F90%3D)
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5/4-9/20+11/30-13/42+15/56-17/72+19/90=
5/4-9/20+11/30-13/42+15/56-17/72+19/90=
5/4-9/20+11/30-13/42+15/56-17/72+19/90=
5/4-9/20+11/30-13/42+15/56-17/72+19/90
=5/4-(4+5)/4*5+(5+6)/5*6-(6+7)/6*7+(7+8)/7*8-(8+9)/8*9+(9+10)/9*10
=5/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10
=1+1/10
=11/10.
11/10
1+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=11/10