分析:(1)102×0.35,运用乘法分配律进行简算;
(2)(8+0.8)×1.25,运用乘法分配律进行简算;
(3)7.7×1.7+2.3×7.7,运用乘法分配律进行简算,
(4)2.98×0.25×40,运用乘法结合律进行简算;
(5)0.28×99,转化为:0.28×(100-1),再运用乘法分配律进行简算;
(6)0.44×2.5,转化为:0.11×4×2.5,再运用乘法结合律进行简算.
解答:解:(1)102×0.35,
=100×0.35+2×0.35,
=35+0.7,
=35.7;
(2)(8+0.8)×1.25,
=8×1.25+0.8×1.25,
=100+10,
=110;
(3)7.7×1.7+2.3×7.7,
=7.7×(1.7+2.3),
=7.7×4,
=30.8;
(4)2.98×0.25×40,
=2.98×(0.25×40),
=2.98×10,
=29.8;
(5)0.28×99,
=0.28×(100-1),
=0.28×100-0.28×1,
=28-0.28,
=27.72;
(6)0.44×2.5,
=0.11×4×2.5,
=0.11×(4×2.5),
=0.11×10,
=1.1.
点评:此题考查的目的是理解掌握乘法交换律、结合律、分配律,并且能够灵活运用这些运算定律进行简便计算.