Toán Lớp 8: $a^{3}$ + $a^{2}$ -ab + $b^{2}$ + $b^{3}$
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Toán Lớp 8: $a^{3}$ + $a^{2}$ -ab + $b^{2}$ + $b^{3}$
giúp mình vớiiii
Comments ( 2 )
Giải đáp:
a^3+a^2-ab+b^2+b^3
= (a^3+b^3)+(a^2-ab+b^2)
= (a+b)(a^2-ab+b^2)+(a^2-ab+b^2)
= (a+b+1)(a^2-ab+b^2)
(a^3 + b^3)+(a^2 – ab + b^2)
=(a+b)(a^2 – ab + b^2) + (a^2 – ab + b^2)
=(a^2 – ab + b^2)(a+b+1)