99×41/42×21 简便方法,
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99×41/42×21简便方法,99×41/42×21简便方法,99×41/42×21简便方法,99×(41/42)×21简便方法解,得：==11*3(41/21)*21==11*3*41==(10+
99×41/42×21 简便方法,
99×41/42×21 简便方法,
99×41/42×21 简便方法,
99×(41/42)×21 简便方法
解,得：
==11*3(41/21)*21
==11*3*41
==(10+1)*123
==1230+123
==1353
99×41/42×21