Упростите выражение: 30 баллов даю
1)(12x^2+9x):(3x)+(6x^3-3x^2): x^2=
2)-(4a^2-3a):a+(8a^3 -4a^2):(2a^2)=
3)(8y^3-5xy^2):y^2+(x^2y-3xy^2):(0,5xy)=
4)-(2x^2y+x^2y):(0,5xy)+(6x^3-2x^2y):x^2=
Помогите пожалуйста (
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