3*20:30 = 2
100:50+(72-47)=27
2=27
17·60000000=1020000000мм=1020км
№191
167,2км=16720000см
<span>16720000:3800000=4,4см </span>
№193
270км=27000000см
27000000÷1,8=15000000
<span>2,7·15000000=40500000см,405к
</span>
(x-1 2/5):10+7 5/12=9
<span> <span> (x-1 2/5):10=9-7 5/12 </span></span>
<span><span> </span></span><span><span> <span>(x-1 2/5):10=8 12/12-7 5/12</span></span> </span><span> </span>
<span> <span> (x-1 2/5):10=1 7/12 </span></span>
<span><span> </span></span><span>x-1 2/5=19/12*10</span>
<span>x=190/12+7/5</span>
<span>x=95/6+7/5</span>
<span>x=475/30+42/30</span>
<span>x=517/30</span>
<span>x=17 7/30</span>
<span>
</span>
<span>
</span>
<span />