Toán Lớp 8: Tính:
a/(2x²-x+5)(2x-3)
b/(2x³-3x²+4x) :2x
c/(3x³+10x²-1):(3x+1)
d/(x^4-6x³+12x²-14x+3):(x²-4x+1)
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Toán Lớp 8: Tính:
a/(2x²-x+5)(2x-3)
b/(2x³-3x²+4x) :2x
c/(3x³+10x²-1):(3x+1)
d/(x^4-6x³+12x²-14x+3):(x²-4x+1)
Comments ( 2 )
Giải đáp + Lời giải và giải thích chi tiết:
$\text{a, ( 2x² – x + 5 ) . ( 2x – 3 ) }$
$\text{= 4x³ – 6x² – 2x² + 3x + 10x – 15}$
$\text{= 4x³ – 8x² + 13x – 15}$
$\text{b, ( 2x³ – 3x² + 4x ) : 2x}$
$\text{= ( 2x³ : 2x ) – ( 3x² : 2x ) + ( 4x : 2x )}$
$\text{= x² – $\dfrac{3}{2}$x + 2}$
$\text{c, ( 3x³ + 10x² – 1 ) . ( 3x + 1 ) }$
$\text{= 9x$^{4}$ + 3x³ + 30x³ + 10x² – 3x – 1}$
$\text{= 9$x^{4}$ + 33x³ + 10x² -3x – 1}$
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