计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,
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计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,
![计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,](/uploads/image/z/20093954-50-4.jpg?t=%E8%AE%A1%E7%AE%97%2C1x1%2F3-7%2F12%2B9%2F20-11%2F30%2B13%2F40-15%2F56%3D%3F%2C)
=1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=0-0+0-0+0-1/8
= -1/8
=1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=0-0+0-0+0-1/8
= -1/8
计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,1/4+1/28+1/70+1/130+1
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