用简便方法计算.415-176-248.29+3.7+0.71+6.3428×78+572×78.

2023-04-26

问题描述:

用简便方法计算.
415-176-24
8.29+3.7+0.71+6.3
428×78+572×78.


最佳答案:

(1)415-176-24
=415-(176+24)
=415-200
=215;

(2)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19;

(3)428×78+572×78
=(428+572)×78
=1000×78
=78000.