Ответ:
(7a+3b)= 3(7a)+7(3b)= 3×7×a+7×3×b= 21a+21b= 21a×7+21b×3= 21(7a)+21(3b)= 21(7a+3b)= (7a+3b):.211
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Ответ:
(7a+3b)= 3(7a)+7(3b)= 3×7×a+7×3×b= 21a+21b= 21a×7+21b×3= 21(7a)+21(3b)= 21(7a+3b)= (7a+3b):.211