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