so Achia cho 15 thi du 7 ban nha!!

\(P=x^2+y^2\)

Có \(x^2\ge0;y^2\ge0\)

\(\Rightarrow P\ge0+0=0\)

Dấu "=" xảy ra khi x = 0 ; y = 0

Vậy Min P = 0 <=> x = 0 ; y = 0

\(\left(2x-3\right)^2-\left(2x+1\right)\left(x-1\right)+3\left(2x-3\right)\)

\(=\left(2x-3\right)\left(2x-3+3\right)+\left(2x+1\right)\left(x-1\right)\)

\(=\left(2x-3\right).2x+2x^2-x-1\)

\(=4x^2-6x+2x^2-x-1\)

\(=6x^2-7x-1\)

1999999999999999999999999999999999999999999999999999999999

\(x^{16}+x^8+1\)

\(=\left(x^8\right)^2+2.x^8.\dfrac{1}{2}+\left(\dfrac{1}{2}\right)^2+\dfrac{3}{4}\)

\(=\left(x^8+\dfrac{1}{2}\right)^2+\dfrac{3}{4}\)

1000+139=1139

Tích mình nhe !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

có 3 chữ C

đáy lớn là

29 x 2 = 58 (cm)

chiều cao là

26,25 : 3,5 x 2 = 15 (cm)

diện tích hình thang là

(29 + 58) x 15 : 2 = 652,5 (cm2)

300+300=600