5/8=1/2+1/8
7/10=1/2+2/10=1/2+1/5
4/5=1/2+3/10=1/2+1/4+1/20
5/6=1/2+2/6=1/2+1/3
Ответ:
1)164:x=41
x=164:41
x=4
164:4=41
41=41
2) x:30=6450
x=30×6450
x=193500
193500:30=6450
6450=6450
509, 587, 739, 907