Ответы на вопрос:
А) x = 2y - 3 3 * ( 2y - 3 ) + 2y = 7 6y - 9 + 2y = 7 8y = 16 y = 2 x = 4 - 3 = 1 б) m = 8 + 3n 2 * ( 8 + 3n) - 3n = 10 16 + 6n - 3n = 10 3n = - 6 n = - 2 m = 8 - 6 = 2
1s14=(2a1+13d)*14/2=(-20-104)*7=-124*7=-867 2 d=(a11-a5)/(11-5)=(36-26)/6=5/3 a1=a5-4d=26-20/3=58/3 a15=a1+14d=58/3+14*5/3=58/3+70/3=128/3 s15=(a1+a15)*15/2=(58/3+128/3)*15/2=180*15/2=90*15=1350 3 d=(a8-a1)/(8-1)=(42-7)/7=5 a6=a1+5d=7+25=32 s6=(a1+a6)*6/2=(7+32)*3=39*3=117 4 a40=a1+39d=36-78=-42 s40=(a1+a40)*40/2=(36-42)*40/2=-6*20=-120 5 d=(a3-a1)/(3-1)=(11-3)/2=4 s7=(2a1+6d)*7/2=(6+24)*7/2=30*7/2=15*7=105
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