Question

(715+730+45):(2-13-12) И 17:(35+14)+(78-14)*(45)
пожалуйста по пунктам и по быстрей пожалуйста

Answer 1

1.
(715+730+45):(2-13-12)=(14/30+7/30+24/30):(2/6-3/6)=45/30 : -1/6 = 45/30 * 6/-1 = 45/-5 = -9
2.
17:(35+14)+(78-14)*(45) = 17: (12/20+5/20)+(7/8-2/8)*4/5 = 17:17/20+5/8*4/5=17*20/17+1/2=20+0,5=20,5

Answer 2

(715+730+45):(2-13-12)
7/15+7/30+4/5=7*2/30+7/30+4*6/30=(14+7+24)/30=45/30
2-1/3-1/2=2*6/6-2/6-3/6=(12-2-3)/6=7/6
45/30:7/6=45*6/30*7=9/7=1 2/7


17:(35+14)+(78-14)*(45)
3/5+1/4=3*4/20+5/20=17/20
7/8-1/4=7/8-2/8=5/8
17:17/20=20
5/8*4/5=1/2
20+1/2=40/2+1/2=41/2=20 1/2