3个回答
展开全部
69x32+148x64-69x80
=69x32+138x64+10x64-69x80
=69x(32+64x2-80)+640
=69x(32+128-80)+640
=69x80+640
=5520+640
=6160
=69x32+138x64+10x64-69x80
=69x(32+64x2-80)+640
=69x(32+128-80)+640
=69x80+640
=5520+640
=6160
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展开全部
69x32+148x64-69x80
=(69x32-69x80)+148x64
=69x(32-80)+(100+48)x64
=69x(-48)+48x64+100x64
=48x(-69+64)+6400
=-240+6400
=6160
=(69x32-69x80)+148x64
=69x(32-80)+(100+48)x64
=69x(-48)+48x64+100x64
=48x(-69+64)+6400
=-240+6400
=6160
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展开全部
69x32+148x69-69x80
=69×(32+148-80)
=69×70
=(70-1)×70
=4900-70
=4830
=69×(32+148-80)
=69×70
=(70-1)×70
=4900-70
=4830
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