(1/(1*2))+(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7))+(1/(7*8))． equation:x=(1/(1*2))+(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7))+(1/(7*8)) (7/8) 今天六1班43个同学数学测验全都合格，用百分数表示合格率是多少． equation