要简便运算;28.8-640%-2.8-4.

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要简便运算;28.8-640%-2.8-4.
要简便运算;28.8-640%-2.8-4.

要简便运算;28.8-640%-2.8-4.
简便运算;28.8-640%-2.8-4.6
28.8-640%-2.8-4.6
=(28.8-2.8)-(640%+4.6)
=26-11
=15

28.8-640%-2.8-4.6
=28.8-6.4-2.8-4.6
=28.8-(6.4+2.8+4.6)
=28.8-13.8
=15

28.8-6.4-2.8-4.6
=28.8-2.8-(6.4+4.6)
=26-11=15