49.8乘50.2用平方差公式计算麻烦你啦!

问题描述:

49.8乘50.2用平方差公式计算
麻烦你啦!

(50-0.2)*(50+0.2)
=2500-0.04
=2499.96

=(50-0.2)*(50+0.2)
=50^2-0.2^2
=2500-0.04
=2499.96

(50-0.2)×(50+0.2)
=50^2-0.2^2
=2500-0.04
=2499.96
^表示平方号

49.8乘50.2
=(50-0.2)×(50+0.2)
=50²-0.2²
=2499.96

49.8乘50.2
=(50-0.2)(50+0.2)
=50²-0.2²
=2500-0.04
=2499.96