4.25减去4.25乘7.18与6.18的差,所得的差再乘0.98,得多少?
问题描述：
4.25减去4.25乘7.18与6.18的差,所得的差再乘0.98,得多少?
答
（4.25- （4.25*7.18-6.18））*0.98
= （4.25-4.25*7.18+6.18）*0.98
= （4.25*(1-7.18)+6.18)*0.98
= ( -4.25*6.18+6.18)*0.98
=(6.18*(1-4.25)*0.98
= -6.18*3.25*0.98
=-19.6833