Question

Tìm x biết:

1. x mũ 4 -x = 0

2. x mũ 4 - x bình = 0

3. x mũ 5 + x bình = 0

4. 3x ( x - 20 ) - x + 20 = 0

Mấy bác giúp e vs, e đag cần gấp lắm, hứa sẽ tick ak, e cảm ơn!!!!!!!!!!!!!!!!!!!

Answer 1

1,\(x^4-x=0\\ ->x\left(x-1\right)\left(x^2+x+1\right)=0\\ ->\left(......\right)\)

2\(x^4-x^2=0\\ ->x^2\left(x^2-1\right)\\ ->x^2\left(x-1\right)\left(x+1\right)\\ ->......\)

3,\(x^5+x^2\\ ->x^2\left(x^3+1\right)\\ ->x^2\left(x+1\right)\left(x^2-x+1\right)\\ ->.......\)

4\(3x\left(x-20\right)-x+20=0->\left(3x-1\right)\left(x-20\right)=0->.....\)