dãy j nhìn lạ thế

A={0+2+4+6+8+10+.......+100}

B={1+3+5+7+9+........+99}

A - B={0+2+4+6+8+10+.....+100} - {1+3+5+7+9+.......+99}

= 2601- 2500=101

<=>(4x-3)³+(5-7x)³+(3x-8)³=-3(3x-8)(4x+3)(7x-5)

=>-3(3x-8)(4x+3)(7x-5)=0

Th1:-3(3x-8)=0

=>3x-8=0

=>3x=8

=>x=\(\frac{8}{3}\)

Th2:4x+3=0

=>4x=-3

=>x=\(-\frac{3}{4}\)

Th3:7x-5=0

=>7x=5

=x=\(\frac{5}{7}\)