6!=4!*5*6
6!+4!=4!*5*6+4!=4!(6*5+1)=4!*31=1*2*3*4*31=24*31=744
<span>1) (</span>126<span>+</span>84<span>)/</span>5<span>=42 </span>км<span> (</span>скорость<span>)</span>
<span>2)<span> (</span>126<span>/42=3 </span>часа<span> </span></span>
<span> </span><span>Ответ: 3 </span>часа<span>.</span>
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</span>
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</span>
57а:3=19а
-21:3= -7
Ответ: 19а-7