7.49-(0.56+2.49)简便运算
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7.49-(0.56+2.49)简便运算7.49-(0.56+2.49)简便运算7.49-(0.56+2.49)简便运算7.49-(0.56+2.49=(7.49-2.49)-0.56=5-0.56=
7.49-(0.56+2.49)简便运算
7.49-(0.56+2.49)简便运算
7.49-(0.56+2.49)简便运算
7.49-(0.56+2.49
=(7.49-2.49)-0.56
=5-0.56
=4.44
=7.49-0.56-2.49
=7.49-2.49-0.56
=5-0.56
=4.44
7.49-(0.56+2.49)
=7.49- 3.05
= 4.44