Ответ:
3. ( 4/7а-1/7а)×а/3=1/7
1) 4/7а-1/7а=3/7а
2) 3/7а×а/3=3а/21а=1/7
4. ( 6+1/b)÷6b+1/b=1
1)6+1/b= 6b+1/b
2) 6b+1/b÷6b+1/b= 6b+1/b×b/6b+1=1
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Ответ:
3. ( 4/7а-1/7а)×а/3=1/7
1) 4/7а-1/7а=3/7а
2) 3/7а×а/3=3а/21а=1/7
4. ( 6+1/b)÷6b+1/b=1
1)6+1/b= 6b+1/b
2) 6b+1/b÷6b+1/b= 6b+1/b×b/6b+1=1