Khong dung may tinh bo tui .Rut gon roi quy dong cac phan so sau
a)\(\frac{17}{20},\frac{13}{15}va\frac{41}{60}\)
b)\(\frac{25}{75},\frac{17}{34}va\frac{121}{132}\)
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a, \(\frac{51}{60};\frac{52}{60};\frac{41}{60}\)
b, \(\frac{1}{3};\frac{1}{2};\frac{11}{12}=\frac{4}{12};\frac{6}{12};\frac{11}{12}\)
a)13/17 < 15/19
a) 2/3 x X + 3/4 = 3
2/3 x X = 3 - 3/4
2/3 x X = 9/4
X = 9/4 : 2/3
X = 27/8
a. Ta có : \(\frac{13}{17}=\frac{247}{323};\frac{15}{19}=\frac{255}{323}\)
Vì 255 > 247 nên 247/323 < 255/323
Hay \(\frac{13}{17}< \frac{15}{19}\)
b. \(\frac{2}{3}\times x+\frac{3}{4}=3\)
\(\frac{2}{3}\times x=3-\frac{3}{4}\)
\(\frac{2}{3}\times x=\frac{9}{4}\)
\(x=\frac{9}{4}:\frac{2}{3}\)
\(x=\frac{27}{8}\)
c. \(720:\left[41-\left(2\times x-5\right)\right]=120\)
\(\left[41-\left(2\times x-5\right)\right]=720:120\)
\(41-\left(2\times x-5\right)=6\)
\(2\times x-5=35\)
\(2\times x=40\)
\(x=20\)
tỉ số phần trăm của hs vắng mặt và số hs cả lớp là
(1+3):40x100%=10%
đs........
2
a)MC:84
\(\frac{3}{4}=\frac{3x21}{4x21}=\frac{63}{84}\)
\(\frac{5}{7}=\frac{5x12}{7x12}=\frac{60}{84}\)
\(\frac{13}{17}=\frac{8x28}{3x28}=\frac{224}{84}\)
tự kl
b)MC:1768
\(\frac{5}{8}=\frac{5x221}{8x221}=\frac{1105}{1768}\)
\(\frac{8}{13}=\frac{8x136}{13x136}=\frac{1088}{1768}\)
\(\frac{13}{17}=\frac{13x104}{17x104}=\frac{1352}{1768}\)
3
\(\frac{64}{96}=\frac{2}{3},\frac{27}{225}=\frac{3}{25},\frac{57}{18}=\frac{19}{6},\frac{72}{376}=\frac{9}{47}\)
tự suy luận nha
a) \(\frac{17}{20}\)=\(\frac{51}{60}\), \(\frac{13}{15}\)=\(\frac{52}{60}\), \(\frac{41}{60}\)
b)\(\frac{25}{75}\)=\(\frac{1}{3}\)=\(\frac{44}{132}\), \(\frac{17}{34}\)=\(\frac{1}{2}\)=\(\frac{66}{132}\), \(\frac{121}{132}\)
Rút gọn:\(\frac{6}{30}=\frac{6:6}{30:6}=\frac{1}{5}\)
\(\frac{4}{10}=\frac{4:2}{10:2}=\frac{2}{5}\)
\(\frac{15}{20}=\frac{15:5}{20:5}=\frac{3}{4}\)
MSC:20
Quy đồng: \(\frac{1}{5}=\frac{1.4}{5.4}=\frac{4}{20}\)
\(\frac{2}{5}=\frac{2.4}{5.4}=\frac{8}{20}\)
\(\frac{3}{4}=\frac{3.5}{4.5}=\frac{15}{20}\)
Trả lời
Bài 1:
-5/80;7/16;-9/20
-5/80=-5/80
7/16=35/80
-9/20=-36/80
Bài 2:
-54/90=-6/10=-3/5=-216/360
-180/288=-20/32=-5/8=-225/360
60/-135=-12/27=-4/9=160/380
\(\frac{3.4+3}{6.5+9}=\frac{3.(4+1)}{3.10.3.3}=\frac{3.5}{3.(10+3)}=\frac{3.5}{3.13}=\frac{5}{14}\)
\(\frac{6 . 9 - 2.17}{63 . 3 - 119}=\frac{3 . ( 17 + 1 )-2 . 17}{189 - 119}\)
\(=\frac{3.17+3-2.17}{70}=\frac{\left(3-2\right).17+3}{70}\)
\(=\frac{17+3}{70}=\frac{20}{70}=\frac{2}{7}\)