Toán Lớp 8: Rút gọn : C=(2x-3)^3-(2x+1).(4y^3-3)+(x-2).(x+2)
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Toán Lớp 8: Rút gọn : C=(2x-3)^3-(2x+1).(4y^3-3)+(x-2).(x+2)
Comments ( 2 )
C = 8x^3 – 3.4x^2.3 + 3.2x.9-27 – 8.x.y^3 +6x -4y^3 +3 + x^2 -4
= 8x^3 -36x^2 + 54.x – 8xy^3 +6x -4y^3 +x^2 -28
= 8x^3 -35x^2 -8xy^3-4y^3 + 60x -28