
展开全部
97²
=(100-3)²
=100²-600+9
=10000-600+9
=9409
728²-272²
=(728+272)(728-272)
=1000x456
=456000
1.22²×9-1.33²×4
=(1.22x3)²-(1.33x2)²
=(3.66+2.66)(3.66-2.66)
=6.32x1
=6.32
=(100-3)²
=100²-600+9
=10000-600+9
=9409
728²-272²
=(728+272)(728-272)
=1000x456
=456000
1.22²×9-1.33²×4
=(1.22x3)²-(1.33x2)²
=(3.66+2.66)(3.66-2.66)
=6.32x1
=6.32
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询