xin giup toi : khong qui dong mau va tu so .So sanh phan so 17/52 va 41/120
khong quy dong tu so va mau so hay so sanh
a) 13/17 va 15/19
tim x biet
a) \(\frac{2}{3}\times x+\frac{3}{4}=3\)
b, 720:[41-(2x x-5)]=120
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. \(720:\left[41-\left(2\times x-5\right)\right]=120\)
\(\left[41-\left(2\times x-5\right)\right]=720:120\)
\(41-\left(2\times x-5\right)=6\)
\(2\times x-5=35\)
\(2\times x=40\)
\(x=20\)
a)\(\frac{13}{17}>\frac{15}{19}\)
b)\(720\div[41-(2x\times5)]=120\) c)\(\frac{2}{3}\times x+\frac{3}{4}=3\)
\(41-(2x\times5)=270\div120\) \(\frac{2}{3}\times x=3-\frac{3}{4}\)
\(41-(2x-5)=6\) \(\frac{2}{3}\times x=\frac{9}{4}\)
\(2x-5=41-6\) \(x=\frac{9}{4}\div\frac{2}{3}\)
\(2x-5=35\) \(x=\frac{9}{4}\times\frac{3}{2}\)
\(2x=35+5\) \(x=\frac{27}{8}\)
\(2x=40\)
\(x=40\div2\)
\(x=20\)
so sanh 2 phan so khong quy dong tu so va mau so hay so sanh phan so \(\frac{23}{48}\)va \(\frac{47}{92}\)
So sánh không quy đồng thì:
\(\frac{23}{48}< \frac{47}{92}\)
k nha
23/48< 47/92
chúc bạn học tốt
So sánh hai p.số mà ko quy đồng:
\(\frac{23}{48}< \frac{47}{92}\)
Chúc học tốt
khong quy dong tu so va mau so so sanh phan so theo cach p/s trung gian : 3/10 va 5/11
\(\frac{3}{10}=\frac{33}{110}<\frac{34}{110};\frac{5}{11}=\frac{50}{110}>\frac{34}{110}\)
=>\(\frac{3}{10}<\frac{5}{11}\)
khong quy dong tu va mau hay so sanh hai phan so
5/6......6/7
5/6 = 35/42
6/7 = 36/42
35/42 < 36/42
Vậy 5/6 < 6/7
tinh tong cac phan so toi gian khong la so tu nhien co mau 11 lon hon 12 va nho hon 35
giup toi voi
Khong quy dong mau so va tu so hay so sanh:
12/48 va 13/47
Viet ro cach giai giup mk nhe! Ai nhanh mk tk cho!
12/48 > 13/47
Đúng 100 % luôn .
Nhớ nhé !
Khong quy dong mau so hay so sanh hai phan so 12 phan 49 va 13 phan 47
Vì \(\frac{12}{49}< \frac{13}{49}\)
\(\frac{13}{49}< \frac{13}{47}\)
Nên \(\frac{12}{49}< \frac{13}{47}\)
Ta có 13/47>13/49
Mà 13/49>12/49
=> 12/49<13/47
\(\frac{12}{49}\)và \(\frac{13}{47}\Rightarrow12.47\)và \(49.13\)\(\Rightarrow564\)và \(637\)
vì 564<637
nên \(\frac{12}{49}< \frac{13}{47}\)
khong quy dong mau so tu so hay so sANH CAC PHAN SO SAU
207/209va 209/211
101/100 va 103/101
79/65va 15/17
47/15 va 65/21
ban nao giai ca bai viet ca loi giai ra minh tick nhe
Khong quy dong mau so hay so sanh 2 phan so sau:12/13 va 13/14
Ta có :
\(\frac{12}{13}=1-\frac{1}{13}\)
\(\frac{13}{14}=1-\frac{1}{14}\)
Vì \(\frac{1}{13}>\frac{1}{14}\)nên \(1-\frac{1}{13}< 1-\frac{1}{14}\)
Vậy \(\frac{12}{13}< \frac{13}{14}\)
Ta thấy:
\(\frac{12}{13}=1-\frac{1}{13}\)
\(\frac{13}{14}=1-\frac{1}{14}\)
Vì 13<14.
=>\(\frac{1}{13}>\frac{1}{14}\)
=>\(1-\frac{1}{13}< 1-\frac{1}{14}\)
=>\(\frac{12}{13}< \frac{13}{14}\)
Vậy......
\(\frac{12}{13}\)và \(\frac{13}{14}\)
Ta có : \(\frac{12}{13}=\frac{12}{13}+\frac{1}{13}\) ; \(\frac{13}{14}=\frac{13}{14}+\frac{1}{14}\)
Ta thấy \(\frac{1}{13}>\frac{1}{14}\)=> \(\frac{12}{13}< \frac{13}{14}\)