简便计算7x65+65x28+35x35
解：采用分配律，
原式=65x（7+28）+35x35
=65X35+35x35
=35x（65+35）
=35x100
=3500
7x65+65x28+35x35
=65x(7+28)+35x35
=65x35+35x35
=35x(65+35)
=35x100
=3500
图
原式=(7+28)x65+35x35
=35x65+35x35
=35x(65+35)
=35x100
=3500
望采纳！
=65*(7+28)+35*35
=35*(65+35)
=3500
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