Câu 1 :
a ) x ² ( x – 2x ³ )
b ) ( x ² + 1 ) ( 5x – x )
c ) ( x – 2 ) ( x ² + 3x – 4 )
d ) ( x – 2 ) ( x – x ² + 4 )
Câu 1 :
a ) x ² ( x – 2x ³ )
b ) ( x ² + 1 ) ( 5x – x )
c ) ( x – 2 ) ( x ² + 3x – 4 )
d ) ( x – 2 ) ( x – x ² + 4 )
a ) x ² ( x – 2x ³ )
= x³ – 2x^5
b ) ( x ² + 1 ) ( 5x – x )
= 5x³ – x³ + 5x – x
c ) ( x – 2 ) ( x ² + 3x – 4 )
= x³ + 3x² – 4x – 2x² + 5x – 6
d ) ( x – 2 ) ( x – x ² + 4 )
= x² – x³ + 4x – 2x – 2x² + 6
Đáp án:
Giải thích các bước giải:
a) `x^2(x-2x^3)=x^3-2x^5`
b) `(x^2+1)(5x-x)=5x^3-x^3+5x-x=4x^3+4x`
c) `(x-2)(x^2+3x-4)=x^3+x^2-10x+8`
d) `(x-2)(x-x^2+4)=-x^3+3x^2+2x=8`