3(t - 4) - 6 = 5(t - 3)
3t - 12 - 6 = 5t - 15
-12 -6 + 15 = 5t - 3t
-3 = 2t
t = -1,5
проверка:
3(-1,5 -4) - 6 = 3 * (-5,5) -6 = -16,5 - 6 = -22,5
5(-1,5 - 3) = 5 * (-4,5) = -22,5
5-3/8=1 5/8
5-2 5/9=2 4/9
2/35*21/44 =3/100
9 3/7*1 1/11 =66/7*12/11=72/7=10 2/7
1 1/15*5/16=16/15*5/16=1/3
7/11*2 5/14 =7/11*33/14=3/2=1 1/2
1 2/23*2,07=1 2/23*2 7/100=25/23*207/100=9/4=2 1/4
2 5/8*0,5*5/7*3,2 =2 5/8*1/2*5/7*3 1/5=21/8*1/2*5/7*16/5=3
4 3/13*13/44=55/13*13/44=5/4=1 1/4
78-(48-24+12)= 42
1) 48-24=24
2) 24+12= 36
3) 79-36=42
Ответ : 42