Question

Очень срочно
3m^2n^4+12m^6n^7=

12x^3×y^2+24xy^3=

(2x^2+7)^2=

(3x-9)^2=

(64x^2-25y^2)=

Answer 1

1.3m^2n^4(1+4m^4n^3)
2.4x^4 +28x^2+49 
3.9x^2 -54x +81=x^2 -6x +9
4.(8x-5y)(8x+5y)