1)25+35=60 (км/ч)
2)250÷60=4 (ч)
3)250-(60×4)=10(мин)
Ответ: не встретятся, через 4 часа, 4ч 10мин
1) 2^(3x-1)=2^(-3); 3x-1=-3; 3x=-2; x=-2/3
2) 3^(x^2+x)=3^0; x^2+x=0; x(x+1)=0; x1=0; x2=-1
3) x>0; x=16^2; x=256
4) x>-2; x+2=1/3; x=-1 2/3
5) 2x-x^2>0; x(x-2)<0; x∈(0;2)
2x-x^2=1; x^2-2x+1=0; (x-1)^2=0; x=1
6) x>1; 2x+1>0; x>-1/2;
x-1=2x+1; x=-2; x∉ОДЗ
7) 3x-2≥0; x≥2/3; x≥0
3x-2=x^2; x^2-3x+2=0;
D=9-4*2=1
x1=(3+1)/2=2; x2=(3-1)/2=1.
4104 = 2³ * 3³ * 19
5544 = 2³ * 3² * 7 * 11
<span>(90050-219*380+190)/90=78</span>
<span>1)219*380=83220; 2)90050-83220=6830; 3)6830+190=7020; 4)7020:90=78</span>
<span><span>(302281-12649)/48+3966=10000</span></span>
<span><span>1)302281-12649=289632; 2)289632:48=6034; 3)6034+3966=10000</span></span>
<span><span><span>(21000-308*29)/4+14147/47=3318</span></span></span>
<span><span><span>1)308*29=8932; 2)21000-8932=12068; 3)12068:4=3017; 4)14147:47=301; 5)3014+301=3318</span></span></span>
<span><span><span><span>13440/32/7+7*123=921</span></span></span></span>
<span><span><span><span>1)13440/32=420; 2)420:7=60; 3)7*123=861; 4)60+861=921</span></span></span></span>
<span><span><span><span><span>(1638/39+13284/36)/0=</span></span></span></span></span>
<span><span><span><span><span>1)1638:39=42; 2)13284:36=369; 3)42+369=411; 4)411:0=тут противоречие.на ноль делить нельзя</span></span></span></span></span>
<span><span><span><span><span><span>509*603-999999/11+3982=220000</span></span></span></span></span></span>
1)509*603=306927; 2)999999/11=90909; 3)306927-90909=216018; 4)216018+3982=220000