1300 + ab = 26 x ab

1300 = 25 x ab

ab = 1300 : 25 = 52

a = 5; b = 2

(1300 + ab) : 26 = ab

50 + ab/26 = ab

ab - ab/26 = 50

25ab = 1300

ab = 54

a=9,b=4

= \(\frac{13}{45}x\left(\frac{15}{26}-1\frac{1}{26}+\frac{11}{26}\right)=\frac{13}{45}x\left(\frac{15}{26}-\frac{27}{26}+\frac{11}{26}\right)=\frac{13}{45}x\left(\frac{27}{26}-\frac{27}{26}\right)=\frac{13}{45}x0=0\)

=26x11=26x11

=286=286

26 x 11 = 26 x (10 + 1)

26 x 11 = 26 x 11

Đề là gì vậy bạn?

=37/39 x 1/111 + 25/26 - 13/26

=1/117 + 6/13

=1/117 + 54/117

=55/117

!!! Hok tốt!!!

\(a,\frac{26}{60}+\frac{3}{15}=\frac{13}{30}+\frac{1}{5}=\frac{13}{30}+\frac{6}{30}=\frac{19}{30}\)

\(b,\frac{4}{26}+\frac{33}{78}=\frac{2}{13}+\frac{11}{26}=\frac{4}{26}+\frac{11}{26}=\frac{15}{26}\)

\(c,\frac{25}{40}-\frac{3}{12}=\frac{5}{8}-\frac{1}{4}=\frac{5}{8}-\frac{2}{8}=\frac{3}{8}\)

\(d,\frac{21}{27}+\frac{10}{54}+\frac{5}{15}=\frac{7}{9}+\frac{5}{27}+\frac{1}{3}=\frac{21}{27}+\frac{5}{27}+\frac{9}{27}=\frac{35}{27}\)

~Study well~

#Thạc_Trân

CẢM ƠN NHA

\(\frac{26.27-212}{26.25+200}\)= \(\frac{702-212}{650+200}\)=\(\frac{490}{850}\)=\(\frac{49}{85}\)

nho k nhe

49/85 nha bn!

Ta có diện tính S_ABC = 26 x36 :2=468 (cm)

Ta có diện tích S_ABC:

_{26x36:2=468(cm)}

Đáp số:468 cm

-HỌC TỐT-GOOD LUCK-