Đáp án:
Giải thích các bước giải:
a, x(3x²-10) - 3x³= 30
<=> 3x³ - 10x - 3x³ = 30
<=> x= -3
b, x(5-2x)+ 2x(x-1)= 6
<=> 5x - 2x² + 2x² - 2x = 6
=> 3x=6 => x = 2
Đáp án + Giải thích các bước giải:
`a) x . (3x^2 - 10) - 3x^3 = 30`
`3x^3 - 10x - 3x^3 = 30`
`-10x = 30`
`x = -3`
Vậy `x = -3`
`b) x . (5 - 2x) + 2x . (x - 1) = 6`
`5x - 2x^2 + 2x^2 - 2x = 6`
` 3x = 6`
` x = 6 : 3`
` x = 2`
Vậy `x = 2`
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