49.5x13.5+50.5x13-0.5x49.5 简便运算

49.5x13.5+50.5x13-0.5x49.5 简便运算
49.5x13.5+50.5x13-0.5x49.5 简便运算

49.5x13.5+50.5x13-0.5x49.5 简便运算
49.5x13.5+50.5x13-0.5x49.5
=49.5x（13.5-0.5）+50.5x13
=49.5x13+50.5x13
=(49.5+50.5)x13
=100x13
=1300
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