Question

128×0.23-0.23×7-0.23的简便运算怎么写？

Answer 1

因为各项均有0.23，
提取公因数，得：
128×0.23-0.23×7-0.23
=0.23×（128-7-1）
=0.23×120
=27.6

Answer 2

128×0.23-0.23×7-0.23
=0.23（128-7-1）
=0.23x120
=12x2.3
=10x2.3+2x2.3
=23+4.6
=27.6