33*4/11+5.12*4/9+5/9*5.12-3/11*33=?
问题描述：
33*4/11+5.12*4/9+5/9*5.12-3/11*33=?
答
33×4/11+5.12×4/9+5/9×5.12-3/11×33
=(33×4/11-3/11×33)+(5.12×4/9+5/9×5.12)
=33×(4/11-3/11)+5.12×(4/9+5/9)
=33×1/11+5.12×1
=3+5.12
=8.12