Решение
(5/12+1/6+3/8) :15/16 = (10 + 4 + 9) /24 = 23/24 * (16/15 = 46/45 = 1(1/45)
5:1(1/4) + 7 :1(1/3) = 5 * (4/5) + 7*(4/3) = 4 + 5(1/4) = 9(1/4)
<span>1/2 + 3/4*8/15 - 3/10 = 1/2 + 2/5 - 3/10 = (5 + 4 - 3)/10 = 6/10 = 3/5</span>
ОДЗ
x>0
5x-4>0⇒5x>4⇒x>0,8
lg(5x-4)≠0⇒5x-4≠1⇒5x≠5⇒x≠1
x∈(0,8;1) U (1;∞)
2lgx=lg(5x-4)
lgx²=lg(5x-4)
x²=5x-4
x²-5x+4=0
D=25-16=9⇒x1+x2=5
45÷80×100=56.25
2.4÷0.6×100=400
83+5y-15=24y-27
5y-24y=-27+15-83
-19y=-95
y=-95÷(-19)
y=5
4000000:100000= 40.
320:40= 8.
<span>Расстояние между городами на карте 8 см.</span>