Toán Lớp 8: Khai triển:
(x+1)^2
(x+2)^2
(x+5)^2
(x+1)^3
(x+2)(x^2 -2x+4)
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Toán Lớp 8: Khai triển:
(x+1)^2
(x+2)^2
(x+5)^2
(x+1)^3
(x+2)(x^2 -2x+4)
Comments ( 2 )
(x+1)^2=x^2+2x+1
to HĐT 1 : (a+b)^2=a^2+2ab+b^2
(x+2)^2=x^2+4x+4
to HĐT 1 : (a+b)^2=a^2+2ab+b^2
(x+5)^2=x^2+10x+25
to HĐT 1 : (a+b)^2=a^2+2ab+b^2
(x+1)^3=x^3+3x^2+3x+1
to HĐT 4 : (a+b)^3=a^3+3a^2b+3ab^2+b^3
(x+2)(x^2-2x+4)=x^3+8
to HĐT 6 : a^3+b^3=(a+b)(a^2+ab+b^2)
Gửi bn nha!