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a) 70x + 84y - 20xy - 24y^2
b) 12y - 9x^2 + 36 - 3x^2y
c) 21yz^2 - 6z - 3z^3 + 42y
d) 30x^3 - 18x^2y - 72y +120x
Các bạn..!!
b) 12y - 9x^2 + 36 - 3x^2y
c) 21yz^2 - 6z - 3z^3 + 42y
d) 30x^3 - 18x^2y - 72y +120x
Các bạn..!!
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