1) x³+3x²+3x+1
2) x³+6x²+12x+8
3) x³+9x²+27x+27
4) x³+12x²+48x+64
5) x³+15x²+75x+125
6) m³-9m²+3m-1
7) m³-6m²+12m-8
8) 27-27m+9m²-m³
9) 64-48m+12m²-m³
10) 125-75m+9m²-m³
11) 8a³+12a²+6a+1
12) 8a³-12a²+6a-1
13) 27a³-27a²+9a-1
14) 27a³-27a²+9a+1
15) 27a³-54ab+36ab²-8b²
Đáp án:
Giải thích các bước giải:
1. x³ + 3x² + 3x + 1 = ( x + 1 )³
2. x³ + 6x² + 12x + 8 = ( x + 2)³
3. x³ + 9x² + 27x + 27 = ( x + 3)³
4. x³ + 12x² + 48x + 64 = ( x + 4)³
5. x³ + 15x + 75x + 125 = ( x + 5)³
6. m³ – 9m² + 3m – 1 = ( m – 1 )³
7. m³ – 6m + 12m – 8 = ( m – 2 )³
8. 27 – 27m + 9m² – m³ = ( 3 – m )³
9. 64 – 48m + 12m² – m³ = ( 4 – m)³
Sửa lại câu 10 nha :
10. 125- 75m +15m² – m³ = ( 5 -m)³
11. 8a³ +12a² + 6a + 1 = ( 2a + 1)³
12. 8a³ – 12a² + 6a – 1 = ( 2a – 1 )³
13. 27a³ – 27a² + 9a – 1 = ( 3a – 1 )³
Sửa câu 14; 15nha :
14. 27a³ + 27a² + 9a+ 1 = ( 3a + 1)³
15. 27a³ – 54a²b + 36ab² – 8b³
= ( 3a – 2b)³
Chúc bn hok tốt !
Đáp án:
Giải thích các bước giải:
$1) x^3+3x^2+3x+1=(x+1)^3$
$2) x^3+6x^2+12x+8=(x+2)^3$
$3) x^3+9x^2+27x+27=(x+3)^3$
$4) x^3+12x^2+48x+64=(x+4)^3$
$5) x^3+15x^2+75x+125=(x+5)^3$
$6) m^3-9m^2+3m-1=(m-1)^3$
$7) m^3-6m^2+12m-8=(m-2)^3$
$8)27-27m+9m^2-m^3=(3-m)^3$
$9) 64-48m+12m^2-m^3=(4-m)^3$
$10)125-75m+9m^2-m^3=(5-m)^3$
$11)8a^3+12a^2+6a+1=(2a+1)^3$
$12)8a^3-12a^2+6a-1=(2a-1)^3$
$13)27a^3-27a^2+9a-1=(3a-1)^3$
$14)27a^3+27a^2+9a+1=(3a+1)^3$
$15)27a^3-54ab+36ab^2-8b^3=(3a-2b)^3$
Xin câu trả lời hay nhất , chúc bạn học tốt ##