计算:148.5×148.5-49.5×49.5+148.5+49.5,
问题描述:
计算:148.5×148.5-49.5×49.5+148.5+49.5,
答
148.5×148.5-49.5×49.5+148.5+49.5
=(148.5-49.5)(148.5+49.5)+(148.5+49.5)
=(148.5+49.5)(148.5+1-49.5)
=198×100
=19800