упрости выражения и найди его значение 5\12b-1\8b+7\12b если b =4\13 8\35 6\49 12\7

решение экспериментальных задач по теме металлы ) из железа получите раствор хлорида железа и докажите что в растворе присутствуют ионы Fe2+

)тут короче надо сопоставить к цифрам буквы. 1) Elementary school 2) Primary school 3) Comprehensive school 4) High school 5) College or futher aducation 6) GCSE 7) A-level exams 8) SAT 9) Eton, Harrow, Winchester 10) Yale, Rrinceton

A)an examination that American high school students take before they go to college 
B)the oldest and the most famous public schools on Britain
C)an Examination in a range of subjects, which is done dy students in schools in England and Wales, usually at the age of 15 or 16. 
D) examinations in different subjects, wihich students in England and Wales take when they are 17/18
E)The oldest and the best universities in the USA
F) a private school in Britain for children of different ages
G)a school for children between 5 and 11 years old in England and Wales
H)a school in the US where basic subjects are taught for the first six years of a child`s education
I)a school that provides education for people whohave left school, not provided by a university
J)a state school in Britain for children over the age of 11 of different abilities
K)a school in the US and Canada for children of 14 or 15 to 18 years old; used in the names of some schools in Britain for children from 11 to 18 years old

в собачьем питомнике находятся 15 такс,пуделейна 7 больше,а собак породы боксёрна 12 меньше,чем пуделей и такс вместе.сколько собак породы находятся в питомнике?