7.5*46.7+59.9*2.5
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7.5*46.7+59.9*2.57.5*46.7+59.9*2.57.5*46.7+59.9*2.57.5*46.7+59.9*2.5=2.5*3*46.7+59.9*2.5=2.5*140.1+5
7.5*46.7+59.9*2.5
7.5*46.7+59.9*2.5
7.5*46.7+59.9*2.5
7.5*46.7+59.9*2.5
=2.5*3*46.7+59.9*2.5
=2.5*140.1+59.9*2.5
=2.5*(140.1+59.9)
=2.5*200
=500
7.5*46.7+59.9*2.5
=2.5*3*46.7+59.9*2.5
=2.5*140.1+59.9*2.5
=2.5*（140.1+59.9）
=2.5*200
=500
原式=2.5*3*46.7+2.5*59.9
=2.5*140.1+2.5*59.9=2.5*200=500
7.5*46.7+59.9*2.5
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