4276怎么巧算(

4276 (624-176)怎么巧算 -
解：4276+ (624-176)＝（4276-176）624 ＝4100+624 ＝4724
9.6×0.25 =（4×2.4）×0.25 =2.4×（4×0.25）2.4×1 =2.4