考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)从左向右进行计算;
(2)运用乘法的分配律进行简算;
(3)运用乘法的交换律、结合律进行简算;
(4)运用除法的性质进行简算;
(5)运用减法的性质进行简算;
(6)运用乘法的分配律进行简算.
解答:
解:(1)0.48÷0.52×0.2
=
×0.2
=
;
(2)3.6×3.4+6.6×3.6
=3.6×(3.4+6.6)
=3.6×10
=36;
(3)125×0.79×0.2×4
=125×0.2×4×0.79
=125×(0.2×4)×0.79
=125×0.8×0.79
=100×0.79
=79;
(4)19.2÷2.5÷8
=19.2÷(2.5×8)
=19.2÷20
=0.96;
(5)41-7.7-2.3
=41-(7.7+2.3)
=41-10
=31;
(6)5.7×8+570×0.02
=5.7×8+5.7×2
=5.7×(8+2)
=5.7×10
=10.
点评:完成此类题目要注意分析式中数的据的特点及内在联系,然后选择合适的简便方法计算.