1.22^2×9-1.33^2×4=

问题描述:

1.22^2×9-1.33^2×4=

1.22^2×9-1.33^2×4
=(1.22×3)²-(1.33×2)²
=3.66²-2.66²
=(3.66+2.66)(3.66-2.66)
=6.32