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简介：
3.29+0.73+2.27
=3.29+(0.73+2.27)
=3.29+3
=6.29（加法结合律）
7.5+2.5-7.5+2.5
=(7.5-7.5)+(2.5+2.5)
=0+5
=5（同级运算交换）
7.325-(5.325+1.7)
=7.325-5.325-1.7
=2-1.7
=0.3（减法的性质）
3.29+0.73-2.29+2.27
=(3.29-2.29)+(0.73+2.27)
=1+3
=4（同级运算交换）
3.29-0.73-2.27
=3.29-(0.73+2.27)
=3.29-3
=0.29（减法的性质）
7.325-3.29-3.325
=7.325-3.325-3.29
=4-3.29
=0.71（减法交换）
7.325-(5.325-1.7)
=7.325-5.325+1.7
=2+1.7
=3.7（前面减号，脱括号变符号）
3.29×0.25×4
=3.29×(0.25×4)
=3.29×1
=3.29（乘法结合律）
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