<span> Напомним. Распределительное свойство умножения —</span>
(a + b) • c = a • c + b • c = ac + bc;
(a - b) • c = a • c - b • c = ac - bc;
Применяем
<span>11*(60+а) = 11*60+11*а=660+11а</span>
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<span><span>21*(38-b)=21*38-21*b=798-21b</span></span>
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<span><span><span>(х-9)*24=24*x-24*9=24x-216</span></span></span>
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<span><span><span><span>(у+4)*38=38*y+38*4=38y+152</span></span></span></span>
<span><span><span><span>Удачи)))</span></span></span></span>
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