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14х = 54,4 - 9,2 - 2,5
14х = 42,7
х = 42,7:14
х=3,05.
B(n) = b₁ + (n-1)*d = -0.8+(n-1)4 = -0.8+4n-4 = 4n-4.8
b(3) = 4*3-4.8 = 7.2
b(7) = 4*7-4.8 = 23.2
b(24) = 4*24-4.8 = 91.2
b(k+1) = 4(k+1)-4.8=4k-0.8
<span>(4 1/9 - а) + 8 5/9=9 2/9</span>
<span>37/9 - a + 77/9 - 83/9 = 0</span>
-a = -31/9 :(-1)
a = 31/9 = 3 4/9
<span>5 3/7 - (b-2 1/7)=2 4/7</span>
<span>38/7 - b + 15/7 - 18/7 = 0</span>
<span>-b = -35/7 :(-1)</span>
<span>b = 35/7 = 5</span>