Irrichi Irrichi 29.03.2016, 18:20:44 0 @Oake: (x+y)^2=x^2+y^2+2*x*y=8^2=642*x*y=(x+y)^2-x^2-y^2=64-40=24x*y=12x^3+y^3=(x+y)(x^2-xy+y^2)=8*(40-12)=8*28=224
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2*x*y=(x+y)^2-x^2-y^2=64-40=24
x*y=12
x^3+y^3=(x+y)(x^2-xy+y^2)=8*(40-12)=8*28=224