Question

rút gọn biểu thức

3x^2 - 2x (5 + 1,5x) +10

5x (3x^2 - 12x + 6) + 4x^3

Answer 1

1, \(3x^2-2x\left(5+1,5x\right)+10\)

= \(3x^2-10x-3x^2+10\)

= \(10-10x\)

= \(10\left(1-x\right)\)

Answer 2

\(\text{a)}3x^2-2x\left(5+1.5x\right)+10\\ =3x^2-10x+3x^2+10\\ =\left(3x^2+3x^2\right)-10x+10\\ =6x^2-10x+10\)

\(\text{b)}5x\left(3x^2-12x+6\right)+4x^3\\ =15x^3-60x^2+30x+4x^3\\ =\left(15x^3+4x^3\right)-60x^2+30x\\ =19x^3-60x^2+30x\)

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