21a+3ab+14+2b=3a(7+b)+2(7+b)=(3a+2)(7+b).
Ответ:
21a + 3ab + 14 + 2b = ( 3a + 2 )*( 7 + b )
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21a+3ab+14+2b=3a(7+b)+2(7+b)=(3a+2)(7+b).
Ответ:
21a + 3ab + 14 + 2b = ( 3a + 2 )*( 7 + b )