1 способ:
( 348 + 537 ) : 3 = 885 : 3 = 295
2 способ:
( 348 + 537 ) : 3 = 348 : 3 + 537 : 3 = 116 + 179 = 295
1 сп.:
( 889 - 385 ) : 7 = 504 : 7 = 72
2 сп.:
( 889 - 385) : 7 = 889 : 7 - 385 : 7 = 127 - 55 = 72
1) 18/30=3/5 15/18=5/6 = 25/30 НОЗ =30
2)28/40=7/10=63/90 10/45=2/9 = 25/30=75/90 НОЗ =90
3)49/105=7/15 =28/60 27/36=3/4 = 45/60 НОЗ =60
4)60/90=2/3 =20/30 15/50=3/10 = 9/30 НОЗ =30
5)10/20=1/2 =15/30, 8/24=1/3 = 10/30 , 9/45=1/5=6/30 НОЗ =5*3*2=30
6)22/44=1/2=10/20 24/30=4/5=16/20 27/36 = 3/4=15/20 НОЗ=20
1,4х-0,6х=0,4-14
0,8х=-13, 6
Х=-13,6:0,8
Х=-17