f(x)=x(mu 6) — 2020x(mu 5) +2020x( mu 4) + 2020x ³ + 2020x ³ — 2020x + 2020
b)3x+6x ²=?
giải giúp mk bài toán này nha mk cần gấp
f(x)=x(mu 6) — 2020x(mu 5) +2020x( mu 4) + 2020x ³ + 2020x ³ — 2020x + 2020
b)3x+6x ²=?
giải giúp mk bài toán này nha mk cần gấp
Đáp án:
Giải thích các bước giải:
Ta có:
a )x⁶-2020x⁵ +2020x⁴ – 2020x³ + 2020x² – 2020x +2020
= 2019⁶- (2019+1)×2019⁵ + (2019+1)×2019⁴- (2019+1)×2019³ + (2019+1)×2019² – (2019+1)×2019 +(2019+1)
=2019⁶ -(2019⁶+2019⁵)+(2019⁵+2019⁴)-(2019⁴+2019³)+(2019³+2019²)-(2019²+2019)+2019+1
=2019⁶-2019⁶-2019⁵+2019⁵+2019⁴-2019⁴-2019³+2019³+2019²-2019²-2019+2019+1
=0+1
=1
b)3x+6x²=3x+6x+1x
=(3+6+1)x
=10x
Đáp án:1
Giải thích các bước giải:
Ta có: x⁶-2020x⁵ +2020x⁴ – 2020x³ + 2020x² – 2020x +2020
= 2019⁶ – (2019+1)×2019⁵ + (2019+1)×2019⁴- (2019+1)×2019³ + (2019+1)×2019² – (2019+1)×2019 +(2019+1)
=2019⁶ -(2019⁶+2019⁵)+(2019⁵+2019⁴)-(2019⁴+2019³)+(2019³+2019²)-(2019²+2019)+2019+1
=2019⁶-2019⁶-2019⁵+2019⁵+2019⁴-
-2019⁴-2019³+2019³+2019²-2019²-2019+2019+1
=0+0+0+0+0+0+1=1