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10.4-9.6×0.5   
0.45×7.5-0.45×6.5
3.12+3.12×99    
4.23×0.8+6.17×0.8.
分析:(1)先算乘法,再算减法;
(2)(3)(4)利用乘法分配律简算.
解答:解:(1)10.4-9.6×0.5
=10.4-4.8
=5.6;

(2)0.45×7.5-0.45×6.5
=0.45×(7.5-6.5)
=0.45×1
=0.45;

(3)3.12+3.12×99
=3.12×(1+99)
=3.12×100
=312;

(4)4.23×0.8+6.17×0.8
=(4.23+6.17)×0.8
=10.4×0.8
=8.32.
点评:小数混合运算抓住运算顺序,适当运用运算定律简算.
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