в 2 раза ...................
d=2r
2 1/5: 1/4 = 21/5:1/4 = 21/5*4/1= 81/5 = 8 1/5 Ответ:8
Х*60=6907+43493
Х*60=50400
Х=50400:60
Х=840
40450:Х=7621-7521
40450:Х=100
Х=40450:100
Х=404,5
1) (ax-ay)=a(x-y);
2) ( cd+ bc)= c(d+b)
3) (xy+2x)=x(y+2)
4) (3x- xy)=x(3-y)