X-ученики
у-лодки
x= 2y +3x= 3y -2
2y +3 = 3y -2 <=> 3y -2y = 3+2 <=> y=5x= 2*5 +3 =13
13 учеников
Y=4/5*3
Y=12/5
1/8:1 1/4=1/8 *4/5=1/10
67*32*46=<span> 67*(32*46)</span>
138*(28*52)=(138*28)*52
<span>94*(17*23) =</span><span>17*94*23 </span>
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<span>2) <span>452*43*12 = 43*12*452</span></span>
<span><span><span>138*(28+52)= 138*28+138*52</span></span></span>
<span><span><span><span>374*(37*53)=(374*37)*53</span></span></span></span>
<span><span><span><span><span>113*86*24= 86*113*24</span></span></span></span></span>
<span><span><span><span><span><span>264*127*8= 8*264*127</span></span></span></span></span></span>
<span><span><span><span><span><span><span>187*106*(93-56)= 187* (106*93-106*56)</span></span></span></span></span></span></span>
1)35-7=28(КМ/Ч)-2 ТЕПЛОХОД
2)35+28=63(КМ/Ч)-СКОРОСТЬ СБЛИЖЕНИЯ
3)63Х2=126(КМ)-2 ЧАСА
2 ВОПРОС.
4)315/63=5(Ч)-ВСТРЕТЯТЬСЯ