15 * (78 : 13) - х = 76
15 * 6 - х = 76
90 - х = 76
х = 90 - 76
х = 14
67*32*46=<span> 67*(32*46)</span>
138*(28*52)=(138*28)*52
<span>94*(17*23) =</span><span>17*94*23 </span>
<span>
</span>
<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>
Уравнение
(х+5):2=5х
х+5=5х*2
х+5=10х
28-20x-12+20x=> 16.Ответ: 16
6x-2y-5x+2y=> x. Ответ: Х