计算下面各题,能简便计算的要用简便方法计算. 296+73+104+37 1600÷25÷4 125×54-46×125
1个回答

解题思路:(1)运用加法交换律和结合律简算;

(2)根据除法的性质简算;

(3)运用乘法分配律简算;

(4)运用加法交换律简算;

(5)先把32分解成8×4,再运用乘法结合律简算;

(6)运用乘法分配律简算.

(1)296+73+104+37,

=(296+104)+(73+37),

=400+110,

=510;

(2)1600÷25÷4,

=1600÷(25×4),

=1600÷100,

=16;

(3)125×54-46×125,

=125×(54-46),

=125×8,

=1000;

(4)50.34+11.645-42.34,

=50.34-42.34+11.645,

=8+11.645,

=19.645;

(5)125×25×32,

=125×25×4×8,

=(125×8)×(25×4),

=1000×100,

=100000;

(6)99+99×99,

=99×(1+99),

=99×100,

=9900.

点评:

本题考点: 整数四则混合运算;运算定律与简便运算.

考点点评: 此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.