6.4﹣5.4÷2.5 0.76×2.5×0.4 0.80×1.2518.5×5.8+5.2×18.5﹣18.5 1.2+36÷[1.44×（0.1﹣0.05）]．
470÷2.5÷40．
0.8××1.25×4．
752×1.25+4.45×12.5+0.035×125．
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4.95×99+4.95．
×1.25×4．
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