如题所述
原式
=33x37+99x21
=33x37+33x3x21
=33x37+33x63
=33x(37+63)
=33x100
=3300
=33x37+99x21
=33x37+33x3x21
=33x37+33x63
=33x(37+63)
=33x100
=3300
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第1个回答 2016-11-24
88+11X11+11X81