Ответы на вопрос:
64 * 4 = 256 56 * 7 = 392 78 : 6 = 13 68 : 4 = 17 (96 : 4 + 90 : 6) * 8 = (24 + 15) * 8 = 39 * 8 = 312
X+y=0.5 x+(y-0.2y)=0.5*(1-0.15) x+0.8y=0,425 y=0.5-x x+0.8*(0.5-x)=0.425 x+0.4-0.8x=0.425 x-0.8x=0.425-0.4 0.2x=0.025 x=0.025/0.2 x=0,125 кг
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