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Có 3 loại như sau:
*Động mạch :lớn nhất:có chức năng đua máu từ tim đến đến các mao mạch toàn cơ thể
-Cấu tạo:+lớp áo trong nằm rong cùng được tạo bởi các tế bào nội môi.
+lớp áo giữa gồm các sợi cơ trơn và các sợi chun
+lớp áo ngoài do các tổ chức sợi tạo nên
*Tĩnh mạch:lớn thứ 2:từ mao mạch,máu đỏ vào những mạch máu vỡi những thành mỏng gọi là tĩnh mạch
-Cấu tạo:+thành động mạch dày và có độ đàn hôi lớn
+ở tĩnh mạch,lớp áo có trong van tĩnh mạch
*Mao mạch:nhỏ nhất:thành mao mạch chỉ có 1 lớp tế bào nội mô,giữa các tế bào này có 1 lỗ nhỏ để quá trình trao đổi chất giữa các tế bào và máu được thực hiện
a) \(\frac{x^2-xy}{5y^2-5xy}\)=\(\frac{x\left(x-y\right)}{-5y\left(x-y\right)}\)=\(\frac{-x}{5y}\)
b) \(\frac{3x^2-12x+12}{x^4-8x}\)=\(\frac{3\left(x^2-4x+4\right)}{x\left(x^3-2^3\right)}\)=\(\frac{3\left(x-2\right)^2}{x\left(x-2\right)\left(x^2+2x+4\right)}\)=\(\frac{3\left(x-2\right)}{x\left(x^2+2x+4\right)}\)
x+y=xy <=> x+y-xy=0 <=> x(1-y) -1+y +1=0 <=> (x-1)(1-y)= -1 Nếu x,y không nguyên thì có vô số nghiệm cứ mỗi x thay vào sẽ có 1 y Nếu x,y nguyên thì giải như sau Từ (x-1)(1-y)= -1 Suy ra x-1, 1-y là các ước nguyên của -1 Suy ra có các trường hợp sau x-1=1 <=> x=2 1-y=-1<=> y=2 Và x-1= -1 <=> x=0 1-y=1 <=> y=0 Vậy có 2 nghiệm là (x,y) = (2,2) và (0,0)
có tất cả
510
chữ số
ai k mình
thì mình k lại
cho thanks
Với x=1/3 => sai , bạn còn thiếu đk r :))
222 + 333= 555
Ta có PT (1) <=> ( x + \(2\sqrt{x}\)+ 1) - (y + z + \(2\sqrt{yz}\)) - \(2\left(\sqrt{y}+\sqrt{z}\right)\)- 1 = 0
<=> (\(1+\sqrt{x}\))2 - (\(1+\sqrt{y}+\sqrt{z}\))2 = 0
<=> \(\orbr{\begin{cases}2+\sqrt{x}+\sqrt{y}+\sqrt{z}=0\\\sqrt{x}-\sqrt{y}-\sqrt{z}=0\end{cases}}\)
Thế vào pt (2) được
y + z \(-\sqrt{3z}-\sqrt{yz}\)+ 1 = 0
<=> (\(\frac{\sqrt{z}}{2}-\sqrt{y}\))2 + (\(\frac{\sqrt{3z}}{2}-1\))2 = 0
<=> \(\hept{\begin{cases}z=\frac{4}{3}\\y=\frac{1}{3}\\x\:=3\end{cases}}\)
Ta có sơ đồ:Chiều dài: /===/===/===/ (Tổng: 27 m)Chiều rộng: /===/===/Tổng số phần bằng nhau là:2 + 3 = 5 ( phần )Chiều dài:27 : 5 . 3 = 16,2 ( m )Chiều rộng:27 - 16,2 = 10,8 ( m )Công thức: Chu vi = ( dài + rộng ) . 2Vậy, chu vi hình chữ nhật là:( 16,2 + 10,8 ) . 2 = 54 ( m ) Đáp số: 54 m