Ответ:
x=3
Пошаговое объяснение:
1/6:(1/4х-1/3)-3/8=1/40
1/6:(1/4х-1/3)=1/40+3/8 1/40+3/8=1/40+15/40=16/40=4/10=2/5
1/6:(1/4х-1/3)=2/5
1/4х-1/3=1/6:2/5 1/6:2/5=1/6*5/2=5/12
1/4x-1/3=5/12
1/4x=5/12+1/3 5/12+1/3=5/12+4/12=9/12=3/4
1/4x=3/4
x=3/4:1/4 3/4:1/4=3/4*4/1=3
x=3
проверка 1/6:(1/4*3-1/3)-3/8=1/40
1/6:(3/4-1/3)-3/8=1/40
1/6:(9/12-4/12)-3/8=1/40
1/6:5/12-3/8=1/40
1/6*12/5-3/8=1/40
2/5-3/8=1/40
16/40-15/40=1/40
1/40=1/40
7/10=3,5/5=10,5/15
10,5/15>8/15
3*100+7*10+9= 300+70+9=379
Ответ:
а) 0.2(12)=212-2/990=210/990
б). 3,(152)=3+152/999
1980 : 18 = (1800 + 180) : 18 = 1800:18+180:18= 100 + 10 = 110
1100 : 55 = ( 550 + 550) : 55 = 550:55 + 550:55 = 10 + 10 = 20