упростите задание 5b+9b; 7d-4d ;n+12n; 3k-k+7k;

Question

упростите задание 5b+9b; 7d-4d ;n+12n; 3k-k+7k;

Answer 1

5b + 9b = 14b
7d - 4d = 3d
n +12n = 13n
3k -k + 7k = 9k

Comments

5b+9b=(b+b)+(5+9)=2b+14=16b

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7d-4d=(7-4)-(d+d)=3-2d=1d

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n+12n=13n

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3k-k+7k=(3k-1)+7k=2k+7k=(2+7)+(k+k)=9+2k=11k

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Вроде всё правильно

Answer 2

5b+9b=14b; 7d-4d=3d; n+12n=13n; 3k-k+7k=2k+7k=9k