题目内容

6.递等式计算,能简算的要用简便方法计算.
2.85-0.9+10.3
3.79+4.52+2.48
32.78-(5.97+2.78)
15.38-2.64-1.36
6.71-2.87+3.29
4.3+15.05+16.7+4.95.

分析 (1)从左向右进行计算;
(2)运用加法的结合律进行简算;
(3)运用减法的性质进行简算;
(4)运用减法的性质进行简算;
(5)运用加法的交换律进行简算;
(6)运用加法的交换律、结合律进行简算.

解答 解:(1)2.85-0.9+10.3
=1.95+10.3
=12.25;

(2)3.79+4.52+2.48
=3.79+(4.52+2.48)
=3.79+7
=10.79;

(3)32.78-(5.97+2.78)
=32.78-5.97-2.78
=32.78-2.78-5.97
=30-5.97
=24.03;

(4)15.38-2.64-1.36
=15.38-(2.64+1.36)
=15.38-4
=11.38;

(5)6.71-2.87+3.29
=6.71+3.29-2.87
=10-2.87
=7.13;

(6)4.3+15.05+16.7+4.95
=4.3+16.7+15.05+4.95
=(4.3+16.7)+(15.05+4.95)
=21+20
=41.

点评 此题主要考查小数加减法四则混合运算的运算顺序,认真审题,利用整数的运算定律对小数进行简算即可.

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