Question

ВОПРОС ЖИЗНИ И СМЕРТИ ПОМОГИТЕ!!!!!!!

0144d077b6ef8573446598da8080930f.doc

3fcd05387d54703ea275ad6e952d5222.doc

Answer 1

$CuBKo;1:\1);left(2frac13-frac{155}{27}right):1frac{19}{27}=left(frac73-frac{155}{27}right):frac{46}{27}=left(frac{63}{27}-frac{155}{27}right):frac{46}{27}=-frac{92}{27}:frac{46}{27}=\=-frac{92}{27}cdotfrac{27}{46}=-2\2);2\3);frac{sqrt{0,25}+0,3}{sqrt{0,81}}=frac{0,5+0,3}{0,9}=frac{0,8}{0,9}=frac89\frac{sqrt{0,25}+0,3}{sqrt{0,81}}=frac{-0,5+0,3}{0,9}=frac{-0,2}{0,9}=-frac29$
$frac{sqrt{0,25}+0,3}{sqrt{0,81}}=frac{0,5+0,3}{-0,9}=frac{0,8}{-0,9}=-frac89\frac{sqrt{0,25}+0,3}{sqrt{0,81}}=frac{-0,5+0,3}{-0,9}=frac{-0,2}{-0,9}=frac29\4);x^2+7x+12=0\D=7^2-4cdot1cdot12=49-48=1=(1)^2\x_{1,2}=frac{-7pm1}{2cdot1}\x_1=-4,;;x_2=-3$
$5);-x(x+2)-(x-7)(x^2+7x+49)=\=-x^2-2x-(x^3+7x^2+49x-7x^2-49x-343)=\=-x^2-2x-(x^3-343)=-x^3-x^2-2x+343$
$CuBKo;2:\1);x^2+2x=0\x(x+2)=0\x=0;;;;x+2=0\x_1=0,;x_2=-2\2);x^2-2,42=0\x^2=2,42\x=pmsqrt{2,42}=pmsqrt{1,21cdot2}=pm1,1sqrt2\3);x^2+8=0\x^2=-8;-;pew.;HET\4);13x^2=0\x^2=0\x=0\5);x^2+5x-50=0\D=25-4cdot(-50)=25+200=225=(15)^2\x_{1,2}=frac{-5pm15}{2}\x_1=-10,;x_2=5$