88.8*8.7+11.2*9.9+11.2*1.2
=(100-11.2)*8.7+11.2*(9.9+1.2)
=100*8.7-11.2*8.7+11.2*11.1
=870+11.2*(11.1-8.7)
=870+11.2*2.4
=870+11.2*(2+0.4)
=870+22.4+4.48
=896.88
用简便方法计算88点八乘八点七加十一点二乘九点九点十一点二乘一点二
88.8*8.7+11.2*9.9+11.2*1.2
=(100-11.2)*8.7+11.2*(9.9+1.2)
=100*8.7-11.2*8.7+11.2*11.1
=870+11.2*(11.1-8.7)
=870+11.2*2.4
=870+11.2*(2+0.4)
=870+22.4+4.48
=896.88