8.8-0.56*(2又5/12-1又19/60+2.275)/二十分之七= (0.1一循环+0.01一循环)/1又2/9
8.8-0.56*(2又5/12-1又19/60+2.275)/二十分之七=(0.1一循环+0.01一循环)/1又2/9=...
8.8-0.56*(2又5/12-1又19/60+2.275)/二十分之七=
(0.1一循环+0.01一循环)/1又2/9= 展开
(0.1一循环+0.01一循环)/1又2/9= 展开
2011-08-08
展开全部
原式= 8.8-0.56(2+5/12-1-9/60+2+11/40)*20/7
= 8.8-0.56(3+5/12-19/60+11/40)*20/7
= 8.8-0.56(3+5/12-19/60+11/40)*20/7
= 8.8-0.56(3+3/8)*20/7
= 8.8-2/25*7(27/8)*20/7
= 8.8-27/5
=44/5-27/5
=17/5
=3.4
= 8.8-0.56(3+5/12-19/60+11/40)*20/7
= 8.8-0.56(3+5/12-19/60+11/40)*20/7
= 8.8-0.56(3+3/8)*20/7
= 8.8-2/25*7(27/8)*20/7
= 8.8-27/5
=44/5-27/5
=17/5
=3.4
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