Ответ: 1) -2,6; 2) 9,25.
\[0.1 + \frac{3}{4}x - 1.15x\] при х = 3;
\[0.1 + \frac{3}{4} \cdot 3 - 1.15 \cdot 3 = 0.1 + 0.75 \cdot 3 - 1.15 \cdot 3 = 0.1 + 2.25 - 3.45 = 2.35 - 3.45 = -1.1\]
\[5\frac{3}{8}y + 2.25y - 1\frac{9}{16}y\] при у = 4;
\[5\frac{3}{8} \cdot 4 + 2.25 \cdot 4 - 1\frac{9}{16} \cdot 4 = 5.375 \cdot 4 + 2.25 \cdot 4 - 1.5625 \cdot 4 = 21.5 + 9 - 6.25 = 30.5 - 6.25 = 24.25\]
Ответ: 1) -2,6; 2) 9,25.
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