Đáp án:
`8-125x^3=(2-5x).(4+10x+25x^2)`
`64x^3+1/8=(4x+1/2).(16x^2-2x+1/4)`
`1-x^2 y^4=(1-xy^2).(1+xy^2)`
Giải thích các bước giải:
`1)`
`8-125x^3`
`=2^3-(5x)^3`
`=(2-5x).[2^2+2.5x+(5x)^2]`
`=(2-5x).(4+10x+25x^2)`
AD: `a^3-b^3=(a-b).(a^2+ab+b^2)`
`\text( )`
`64x^3+1/8`
`=(4x)^3+(1/2)^3`
`=(4x+1/2).[(4x)^2-4x.(1)/(2)+(1/2)^2]`
`=(4x+1/2).(16x^2-2x+1/4)`
AD: `a^3+b^3=(a+b).(a^2-ab+b^2)`
`\text( )`
`1-x^{2}y^{4}`
`=1^2-(xy^2)^2`
`=(1-xy^2).(1+xy^2)`
AD: `a^2-b^2=(a-b).(a+b)`
