Đáp án+Giải thích các bước giải:
`(4x+3)^3+(5-7x)^3+(3x-8)^3`
`=(4x)^3 +3.(4x)^2 .3+3.4x.3^2+3^3+5^3-3.5^2 .7x+3.5.(7x)^2-(7x)^3+(3x)^3-3.(3x)^2 .8+3.3x. 8^2-8^3`
`=64x^3+144x^2+108x+27+125-525x+735x^2-343x^3+27x^3-216x^2+576x-512`
`=(64x^3-343x^3+27x^3)+(144x^2+735x^2-216x^2)+(108x+576x-525x)+(27+125-512)`
`=-252x^3+663x^2+159x-360`