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15.2.1 ?????

15.2.1 ?????. ?? 1 ???? ??????????????????????????????????????????????????????. ( a+b )( m+n )= am+an+bm+bn. ?? 2 ????????????????. ( x +1)( x ? 1) ? (2) ( a +2)( a ? 2) ? (3) (3 ? x )(3+ x ) ? (4) ( 2x+ 1)( 2x ? 1 ). ( a+b )( a ? b ) =. a 2 ? ab+ab ? b 2 =. a 2 ? b 2.

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???????. ??. ????????. ????????????????????????? a ??? m ??????????? b ????? n ????????????????????. bm. am. an. bn. ????????????????????????? a ??? m ??????????? b ????? n ????????????????????. a. b. am. bm. m. n. bn. an. ( a + b )( m + n ) ? 2. (am + an + bm + bn) ? 2.

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???? ???

????????. ???? ???. ????? ?. 1 . ??????????? ????. ?. 2 . ( a + b ) X =. aX + bX. ? ? ?. ????? ( a + b ) X = aX + bX. ? X = m + n ? , ( a + b ) X = ?. ( a + b ) X = ( a + b )( m + n ). ( a + b )( m + n ) = ?.

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15.2.1 ?????

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