goi so do la abcde

b = a x 2 c = b x 2 d = c x 2

ta thu a = 1

thi duoc 12480 

Dien tich hien tai la:

75 x 44 = 3300(\(m^2\))

Chieu rong them 6 m thi dai so met la:

44 + 6 = 50(m)

Chieu dai luc do a:

3300 : 50 = 66(m)

Thi phai bot chieu dai so met la:

75 - 66 = 9(m)

Dap so :9m

binh phuong co ten khac la mu 2

la luy thua

vi du:

\(a^2\)doc la a mu hai 

ta co:

\(a^2\)=a.a 

6 kg

\(\dfrac{5x^4-5x}{2x^3-4x^2+2x}\)

=\(\dfrac{5\left(x^4-x\right)}{2\left(x^3-2x+x\right)}\)

=\(\dfrac{5\left(x\left(x^3-1\right)\right)}{2\left(x\left(x^2-1+1\right)\right)}\)

=\(\dfrac{5\left(x\left(x^2-1\right)\right)}{2x^3}\)

=\(\dfrac{5\left(x^2-1\right)}{2x^2}\)

=\(\dfrac{5x^2-5x}{2x^2}\)

=\(\dfrac{5-5x}{2}\)

\(372^3\)+\(128^3\)

su dung 7 hang dang thuc ta co

(372 + 128 ).(\(372^2\)-372.128 + \(128^2\))

500.(\(372^2\)+372.128+\(128^2\))

dua ve dang :

372.372-372.128+128.128 chia het cho 2

372(372-1).128(128+1)

372.371.128.129

ta co: tat ca so cuoi cung nhan lai bang

2.1.8.9= 144 

144 la so chia het cho 2

nen \(372^3\)+\(128^3\) chia het cho 1000

8 or 9

WTP

Korean

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