Ответ:
Пошаговое объяснение:
6х÷8=12÷3
6х=8×12÷3
6х=32
Х=32÷6
Х=5 1/3
31÷(7х)=1÷4
7х=31×4÷1
7х=124
Х=17 5/7
17у÷85=4÷5
17у=85×4÷5
17у=68
У=4
1,3÷(3 1/4у)=2 1/3÷1/6
3 1/4у=1,3×1/6÷2 1/3
3 1/4у=13/140
У=13/140÷3 1/4
У=1/35
1 3/7у÷4 1/7=7 1/3÷3,3
1 3/7у=4 1/7×7 1/3÷3,3
1 3/7у=9 13/63
У=9 13/63÷1 3/7
У=6 4/9
1,5÷3 7/19=4/5у÷2 3/8
4/5у=1,5×2 3/8÷3 7/19
4/5у=1 59/1024
У=1 1319/4096
3/8:3/11=а:2 1/11
11/8 = a : 2 1/11
a = 11/8 * 2 1/11
a = 11/8 * 23/11
a = 23/8
a = 2 7/8
======или так=====
3/11 * a = 3/8 * 2 1/11
3/11a = 3/8 * 23/11
3/11a = 69/88
a = 69/88 * 11/3