Question

12.7*7.5减26*0.75减0.75简便方法？

Answer 1

12.7x7.5-26x0.75-0.75
=127x0.75-26x0.75-0.75
=0.75x(127-26-1)
=0.75x100=75

Answer 2

12.75×7.5-26×0.75-0.75
=7.5×（12.75-2.6-10）
=7.5×0.15
=（7+0.5）×0.15
=7×（0.1+0.05）+0.5×（0.1+0.05）
=0.7+0.35+0.05+0.025
=1.05+0.075
=1.125