(2x1.4-3x(-0.7))-(-3x(-0.7)-1.4)=(2.8+2.1)-(2.1-1.4)=4.9-0.7=4.2
1) y = 7x + 1
<u>-y = -6x - 2</u>
0 = x - 1 x = 1
y = 7*1 + 1 = 7 + 1 = 8.
<u>
2</u>) (a¹⁰ + a⁸) / (a⁶ + a⁴) = (a⁸(a² + 1)) / (a⁴(a² + 1)) = a⁴.
<span>При a= 2/3 выражение равно 2</span>⁴ / 3⁴ = 16 / 81.
142 600=1,426*10∧5 (десять в 5 степени)
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