Ответ:
Объяснение1)6<3a<21
12<4b<16
6-12<3a-4b<21-16
-6<3a-4b<5
2)1/4<1/b<1/3
2*1/4<a/b<7*1/3
1/2<a/b<7/3
3)2<a<7
6<3a<21
2<3a-4<17
1/17<1/(3a-4)<1/2
2/17<2/(3a-4)<1
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Ответ:
Объяснение1)6<3a<21
12<4b<16
6-12<3a-4b<21-16
-6<3a-4b<5
2)1/4<1/b<1/3
2*1/4<a/b<7*1/3
1/2<a/b<7/3
3)2<a<7
6<3a<21
2<3a-4<17
1/17<1/(3a-4)<1/2
2/17<2/(3a-4)<1