Câu hỏi của Trần Đăng Khoa

Question

a) (x + 2)^2 .      b) (x + 1)^3 .      c) x^2 – 3^2 . Khai triển hằng đẳng thức: trình bày ra hết lun

Nguyễn Hoàng Minh · Accepted Answer

$a,=x^2+4x+4\
b,=x^3+3x^2+3x+1\
c,=\left(x-3\right)\left(x+3\right)$Câu trả lời: $a,=x^2+4x+4\
b,=x^3+3x^2+3x+1\
c,=\left(x-3\right)\left(x+3\right)$

Liah Nguyen · Answer

a,$\left(x+2\right)^2=x^2+2.x.2+2^2=x^2+4x+4$b, $\left(x+1\right)^3=x^3+3.x^2.1+3.x.1^2+1^3=x^3+3x^2+3x+1$c,$x^2-3^2=\left(x-3\right).\left(x+3\right)$Câu trả lời: a,$\left(x+2\right)^2=x^2+2.x.2+2^2=x^2+4x+4$b, $\left(x+1\right)^3=x^3+3.x^2.1+3.x.1^2+1^3=x^3+3x^2+3x+1$c,$x^2-3^2=\left(x-3\right).\left(x+3\right)$

Đoàn Phương Linh · Answer

a,(x+2)2=x2+2.x.2+22=x2+4x+4(x+2)2=x2+2.x.2+22=x2+4x+4b, (x+1)3=x3+3.x2.1+3.x.12+13=x3+3x2+3x+1(x+1)3=x3+3.x2.1+3.x.12+13=x3+3x2+3x+1c,x2−32=(x−3).(x+3)Câu trả lời: a,(x+2)2=x2+2.x.2+22=x2+4x+4(x+2)2=x2+2.x.2+22=x2+4x+4b, (x+1)3=x3+3.x2.1+3.x.12+13=x3+3x2+3x+1(x+1)3=x3+3.x2.1+3.x.12+13=x3+3x2+3x+1c,x2−32=(x−3).(x+3)

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)