8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20原式=
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![8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20原式=](/uploads/image/z/263198-38-8.jpg?t=8.8-0.56%2A%282%E5%8F%885%2F12-1%E5%8F%8819%2F60%2B2.275%29%2F7%E5%88%86%E4%B9%8B20%E5%8E%9F%E5%BC%8F%3D)
8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20原式=
8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20
原式=
8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20原式=
8.8-0.56*(2又5/12-1又19/60+2.275)/7分之20
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