12 35\45 + 9 17\36 = 12*45+35\45 + 9*36+17\36=540+35\45 + 324+17\36 = 575\45 + 341\36= 575*4\45*4 + 341*5\36*5= 2300\180+1705\180= 4005\180= 89*45\4*45 = 89\4 =22 1\4
(48*9+5*34)*100-72/3*1000+295000=(432+170)*100-24*1000+295000=
=602*100-24000+295000=60200-24000+295000=36200+295000=331200
По действиям
1)48*9=432
2)5*34=170
3)432+170=602
4)602*100=60200
5)72/3=24
6)24*1000=24000
7)60200-24000=36200
8)36200+295000=331200
10*x=200
x=200÷10
x=20
x÷20=60
x=60*20
x=1200
x-380=2000÷50
x-380=40
x=420
25-x=640÷40
25-x=16
x=9