Пошаговое объяснение:
−387−85=−(387+85)=−(387+5)=−3812=−(3+184)=−484=−421
-4-2\frac{1}{3}=-(4+2\frac{1}{3})=-6\frac{1}{3}−4−231=−(4+231)=−631
\frac{1}{3} -5\frac{2}{3} =-(5\frac{2}{3}-\frac{1}{3})=-5\frac{1}{3}31−532=−(532−31)=−531
\frac{11}{12}- 1\frac{3}{8} =\frac{22}{24} -1\frac{9}{24} =\frac{22}{24} -\frac{33}{24} =-(\frac{33}{24}-\frac{22}{24})=\frac{11}{24}1211−183=2422−1249=2422−2433=−(2433−2422)=2411
20000 * 7% = 1400
10000 * 7% = 700
1400 + 700 = 2100 за год %
20000-10000+2100 = 12100
100 / x + 15 = 35
100 / x = 35 - 15
100 / x = 20
x = 100 / 20
x = 5
Ответ: x = 5