先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14怎样简便就怎样算9/7÷11/6＋2/9×6/11 5÷5/7-5/7×1/5 5/16＋(7/16-1/4)÷1/2

Question

先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14
怎样简便就怎样算
9/7÷11/6＋2/9×6/11 5÷5/7-5/7×1/5
5/16＋(7/16-1/4)÷1/2

Answer 1

28/11= 28:11 (最简了)
400:25=16:1 (同时除以25)
0.45:0.5=45:50=9:10
0.7/14=7/140=1/20=1:20
9/7÷11/6＋2/9×6/11 (这道题有疑问,第一个数是9/7还是7/9)
①如果是:
9/7÷11/6＋2/9×6/11
=9/7×6/11+2/9×6/11
=(9/7+2/9)×6/11
=95/63×6/11
=190/231
②如果是7/9÷11/6＋2/9×6/11
= 7/9×6/11+2/9×6/11
=(7/9+2/9)×6/11
=1×6/11
=6/11
5÷5/7-5/7×1/5
=5×7/5-5/7×1/5
=7-1/7
=6又6/7
5/16＋(7/16-1/4)÷1/2
=5/16+(7/16-1/4)×2
=5/16+7/16×2-1/4×2
=5/16+14/16-1/2
=5/16+14/16-8/16
=(5+14-8)/16
=11/16