Упростите выражение (многочлены 7 класс) пожалуйста помогите!!! 1) (x+2)(x+3)-3x(2-x)=
2) (a+4)(a-3)+(a-5)(a+7)=
3)(c-8)(2c-1)-(3c+5)(c-7)=
4)(4m-n)(4m+3n)-(2m-9n)(8m+n)=
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