Помогите решить пожалуйста. Если можно , распишите решение: 1) 2*(M-b)=14a-2b
2) M*(2a+3b)=- 6a -9b
3) N*(2X -M) =12X^2 - 18XY
4) 3a*(N+M)=15abc-3ac^2
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