Question

五点5×7点7+33×0点55-5点5×0点一，的简便方法？

Answer 1

5.5×7.7+33×0.55-5.5×0.1
=5.5×（7.7+3.3-1.1）
=5.5×10
=55

Answer 2

5.5*7.7+33*0.55-5.5*0.1
=5.5*7.7+3.3*5.5-5.5*0.1
=（7.7+3.3-0.1）*5.5
=10.9*5.5=59.95