1) 7•7=49
2)49-7=42
3)7:7=1
4)7+1=8
5)42+8=50
Верно.
<em>Ответ:</em>
<em>Р = 54 см</em>
<em>Пошаговое объяснение:</em>
<em>A=28 см
</em>
<em>b = 28:4=7 см (в 4 раза короче первой)
</em>
<em>с = 7+12=19 см (на 12 см длиннее второй)
</em>
<em>Периметр равен:
</em>
<em>Р=a+b+c=28+7+19=54 см</em>
<span>(х-15.7):5.14+4/3=6 1/3</span>
<span>x/5.14-785/257+4/3-6 1/3=0</span>
<span>x/5.14-2070/257=0</span>
<span>x=(2070/257)*5.14</span>
x=41.4
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+ - +
-------[-2]--------(3)----------------->x
x∈(-∞;-2]∪(3;∞)