5/16 3/4=16
2/3 7/18 =18
11/12 23/60=60
4/5 1/6=30
8/9 2/7=63
7/8 6/11 =88
4/15 5 /12=60
11/12 17/18 =216
23/30 2/45=90
3/56 7/ 126=21168
15/52 13/78=4056
29/180 35/216 =38880
-2 (8a+7b)+4 (a-2b)=-16a-14b+4a-8b=-24a-22b
1) 3/7:1/14=3/7*14/1=6
2) 7,5-6=1,5
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