1) 25 * 20 * 5 * 7 * 4 = ( 25 * 4) * ( 20 * 5 ) * 7 = 100 * 100 * 7 = 70000
2) 25 * 42 + 15 * 42 = 42 * ( 25 + 15 ) = 42 * 40 = 1680
3) ( 200 - 4 ) * 25 = ( 200 * 25 ) - ( 4 * 25 ) = 5000 - 100 = 4900
В 27 дм 2700 мм т.к в 1 дм 100 мм
(705 - 245) : 5 = 92
705 - 245 = 460
460 : 5 = 92
1,02=11/50=51/50
1) 51/50:1/50=51/50*50/1=51
2) 7,26=363/50
363/50:11/70=363/50*70/11=77/5=15,4
3) 51-15,4=35,6
4)35,6:3,2=11,125=11,1/8
5) 0,4:0,36=2/5:9/25=2/5*25/9=10/9=1,1/9
6)11,1/8+1,1/8=12.17/72