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triplehac29
2 năm trước
Các bạn giúp mình với!!!!! CMR: $a)$$(x+y)^{2}$ -$y^{2}$ =$x(x+2y)$ $b)$$(x^{2}$+ $y^{2})$$^{2}$- $(2xy)^{2}$ =$(x+y)^{2}$ $(x-y)^{2}$ $c)$$(x+y)^{3}$= $x(x-3y)^{2}$ +$y(y-3x)^{2}$
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