`#AkaShi`
`m³+9m²n+27mn²+27n³`
`=m³+3*m²*3n+3*m*9n²+(3n)² `
`=(m+3n)³`
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`(x³)/8-3/4x²y²+3/2xy^4-y^6`
`=(x/2)³-3*1/4*x²*y^2+3*1/2x*(y^2)^2-(y^2)^3`
`=(x/2-y²)³`
........................
`(z-t)³+15(z-t)²+75(z-t)+125`
`=(z-t)³+3xx5xx(z-t)²+3xx25xx(z-t)+(5)²`
`=(z-t+5)³`
Câu `c` xem lại đề
.................
Dạng đúng của nó:
`8a³-48a²b+96ab²-64b³`
`=(2a)^3-3xx4xx4xxa^2b+3xx2xx26xxaxxb^2-(4b)^3`
`=(2a-4b)^3`