6.36﹣2.22+2.64﹣0.78
12.5×（8﹣0.8）×4
1.25×6.4×0.25×0.2
7.5×10﹣7.5×6.5+7.5×0.5
（2.6×1.5+1.1）﹣2.5×8
8÷[（40.75﹣9.5）×0.4]﹣0.6．