Ta có chiều dài hình chữ nhật là \(\frac{6}{7}\)+\(\frac{1}{2}\)=\(\frac{19}{14}\)m

Chu Vi hcn là \(\left(\frac{6}{7}+\frac{19}{14}\right)\)x2=\(\frac{31}{7}m\)

Diện tích hcn là \(\frac{6}{7}X\frac{19}{14}=\frac{57}{49}m^2\)

d/s

ko biet

\(7+\frac{1}{15}=\frac{105}{15}+\frac{1}{15}=\frac{106}{15}\)

=106/15

tổng chiều dài và rộng là:2700-2340=360(m)

chiều rộng là:(360-8):2=176(m)

chiều dài là:360-176=184(m)

đáp số:dài:184 mét , rộng:176m

nhớ k hộ mình nha

lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllbbbbbbbbbbbbbbbbbbllllllllllllllllllllllllllllllllllllllllllllllllllllllbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbblllllllllllll

386 + 720 + 879 - 20 x 3 + 17= 1942

bằng 1942

móa hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

\(=\frac{13}{7}-\frac{4}{7}\)

\(=\frac{9}{7}\)

Đáp án : 9/7 .

\(\frac{2}{4}.\frac{16}{2}.\frac{9}{12}=\frac{1}{2}.8.\frac{3}{4}=3\)