Lời giải:
`d)`
`1/64-3/8y+3y^(2)-8y^3`
`=(1/4)^(3)-3.(1/4)^(2).2y+3.(1)/4.(2y)^(2)-(2y)^3`
`=(1/4-2y)^3`
Áp dụng HĐT số `5 : (a-b)^3=a^(3)-3a^(2)b+3ab^(2)-b^3`
Đáp án + Giải thích các bước giải:
-Áp dụng hằng đẳng thức số 5
d)1/64-3/8 y+3y²-8y³
=(1/4)³-(1/4)².3.2y+1/3.3.(2y)²-(2y)³
=(1/4-2y)³
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