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数学公式②0.25×0.09×8
③1÷[数学公式÷(1-数学公式)]数学公式×18+数学公式×11.

解:①
=×
=

②0.25×0.09×8
=0.25×8×0.09,
=2×0.09,
=0.18;

③1÷[÷(1-)]
=1÷[÷],
=1÷
=

×18+×11
=×11+×11,
=(+)×11,
=1×11,
=11.
分析:①③可根据四则混合运算的运算顺序计算:先算乘除,再算加减,有括号的要先算括号里面的;
②可根据乘法交换律计算;
③可根据乘法交换律及分配律计算.
点评:完成本题要注意分析式中数据,然后运用合适的方法进行计算.
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