Question

用简便方法计算下面题 0.78×98=

Answer 1

0.78除以98等于0.78x(100减2)，0.78乘100减去0.78乘2等于78减0.56等于77.44

追答

78减1.56等于76.44

Answer 2

0.78*(100-2)
=0.78*100-0.78*2
=78-1.56=76.44

Answer 3