1)а)(3n-4)²=9n²-24n+19;
б)(m-2)²-(m+1)(m-3)=m²-4m+4-(m²-3m+m-3m)=m²-4m+4-m²+3m-m+3m=m+4
в)5(b-c)²+10dc=5(d²-2dc+c²)+10dc=5d²-10dc+5c²+10dc=5d²+5c²
г)x³+(2-x)(x²+2x+4)=x³+2x²+4x+8-x³-2x²-4x=8
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1)а)(3n-4)²=9n²-24n+19;
б)(m-2)²-(m+1)(m-3)=m²-4m+4-(m²-3m+m-3m)=m²-4m+4-m²+3m-m+3m=m+4
в)5(b-c)²+10dc=5(d²-2dc+c²)+10dc=5d²-10dc+5c²+10dc=5d²+5c²
г)x³+(2-x)(x²+2x+4)=x³+2x²+4x+8-x³-2x²-4x=8