Question

十乘以十一分之三加十一乘以十二分之三佳十二乘以十三分之三怎样简便计算

Answer 1

十乘以十一分之三加十一乘以十二分之三佳十二乘以十三分之三
=10*3/11+11*(3/12)+12*(3/13)
=3(10/11+11/12+12/13)
=3(1-1/11+1-1/12+1-1/13)
=6-(1/11+1/12+1/13)
=6-431/1716
=5又1285/1716

Answer 2

10*3/11+11*3/12+12*3/13
=3(10/11+11/12+12/13)
=3(1-1/11+1-1/12+1-1/13)
=3(3-1/11-1/12-1/13)
=9-[3（1/11+1/12+1/13）]
=9-3（431/1716）
=9-1293/1716
=9-0.75=8.25