1988+1989乘以1987/1988乘以1989-1

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1988+1989乘以1987/1988乘以1989-11988+1989乘以1987/1988乘以1989-11988+1989乘以1987/1988乘以1989-1整理得到1988+1989乘以1

1988+1989乘以1987/1988乘以1989-1
1988+1989乘以1987/1988乘以1989-1

1988+1989乘以1987/1988乘以1989-1
整理得到1988+1989乘以1987/1988乘以1989-1
即 3977*1987/1988*1988
即3977*1987=7902299