Используя равенства (a+b)*c=ac+bc и (a+b)*(c+d)=(a+b)*c+(a+b)*d раскройте скобки и упростите выражение a) (a+3)(4+d)
б)(x+2)(x+5)
в)(7-n)(n+2)
г) (9+b)(2+b)
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