Question

化简:(1-3m)/2 - (2m+5)/3 + (3-2m)/4，其中m=10分之1

Answer 1

全部通分以12做分母，有【6(1-3m) - 4(2m+5)+3 (3-2m)】/12=[6-18m-8m-20+9-6m]/册银厅12
=(-17-32m)/12代入m=10分之1
那州隐么原式=（搏顷-17-3.2）/12≈-1.68

Answer 2

(1-3m)/2 - (2m+5)/派坦慧3 + (3-2m)/4
＝1/2－6m﹣3m﹣15﹢12﹣8m
=14 1／2 ﹣17m
当信敏m等于1／尘答10
14 1／2 ﹣17m=－0.3

Answer 3

(1-3m)/2 - (2m+5)/3 + (3-2m)/4
=1/2-3/2m-2/3m-5/3+3/4-1/2m
=-(3/2+1/磨厅2+2/3)m+(1/2+3/哗游早4-5/3)
=-10/3m+(6/12+9/12-20/乱雀12)
=-10/3m-5/12
=-10/3x1/10-5/12
=-1/3-5/12
=-4/12-5/12
=-3/4