解题思路:(1)运用加法交换律简算;
(2)根据减法的性质简算;
(3)根据加法交换律和结合律简算;
(4)根据加法结合律和减法的性质简算.
(1)4.45+0.63+5.55,
=4.45+5.55+0.63,
=10+0.63,
=10.63;
(2)5.28-(2.9+1.28),
=5.28-1.28-2.9,
=4-2.9,
=1.1;
(3)5.25+7.86-2.86+4.75,
=(5.25+4.75)+(7.86-2.86),
=10+5,
=15;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.
点评:
本题考点: 小数四则混合运算;运算定律与简便运算.
考点点评: 此题考查小数的加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.