解题思路:(1)可以先算1.28+1.46=2.74,再算38.6+274;
(2)可以运用减法的性质简算;
(3)(4)从左往右依次运算;
(5)(6)先算括号内的,再算括号外的.
(1)38.6+1.28+1.46,
=38.6+(1.28+1.46),
=38.6+2.74,
=41.34;
(2)5.7-1.26-3.04,
=5.7-(1.26+3.04),
=5.7-4.3,
=1.4;
(3)17.8+0.42-4.81,
=18.2-4.81,
=13.41;
(4)15.4-0.82+1.67,
=14.58+1.67,
=16.25;
(5)8.65-(3.56+1.8),
=8.65-5.36,
=3.29;
(6)6.5+(12.08+4.36),
=6.5+16.44,
=22.94.
点评:
本题考点: 小数四则混合运算.
考点点评: 完成此题,注意运算顺序以及运算法则.