简便计算:65×99 99×65+65 101×65-65
问题描述：
简便计算:65×99 99×65+65 101×65-65
简便计算:65×99
99×65+65
101×65-65
61.24-23.1-16.9
87.36-5.4-11.36
答
65×99
=65x(100-1)
=65x100-65x1
=6500-65
=6435
99×65+65
=(99+1)x65
=100x65
=6500
101×65-65
=(101-1)x65
=100x65
=6500
61.24-23.1-16.9
=61.24-(23.1+16.9)
=61.24-40
=21.24
87.36-5.4-11.36
=(87.36-11.36)-5.4
=76-5.4
=70.6
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