Объяснение:
a) S=6a^2
a=2x-3
S=6×(2x-3)^2=6(4x^2-12x+9)=
=24x^2-72x+54
б)
V=a^3
V=(2x-3)^3=
=((2x)^3-3(2x)^2×3 +3×2x×3^2-3^3=
=8x^3-9×4x^2+54x-27=
=8x^3-36x^2+54x-27
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Объяснение:
a) S=6a^2
a=2x-3
S=6×(2x-3)^2=6(4x^2-12x+9)=
=24x^2-72x+54
б)
V=a^3
a=2x-3
V=(2x-3)^3=
=((2x)^3-3(2x)^2×3 +3×2x×3^2-3^3=
=8x^3-9×4x^2+54x-27=
=8x^3-36x^2+54x-27