tim so trung gian
so sanh 11/19 va 13/18
so sanh 5/9va 7/8
so sanh 5/11va 4/13
1) tim x biết:
a) (19.x +2.5^2) : 14=(13-8)^2 - 4^2
b) 2.3^x=10.3^12+8.27^4
2) so sanh
a) 5^23 va 6.5^22
b)21^15 va 27^5.49^8
c)3^39 va 11^21
d) 7.2^13 va 2^16
so sanh phan so sau:1/13^17 va 1/5^11
so sanh 2 phan so sau
a 3 phan 5 va 4 phan 5
b 12 phan 13 va 13 phan 13
câu a) 3/5 < 4/5
câu b)12/13 < 13/13
nhé bạn
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 a/ 63 ^15 va 34^18 b/ 83^9 va 26^12 c/ 64^5 va 11^10 d/ 65^4 va 7^6 e/ 244^11 va 80^13
so sanh phân số 5/13 và 4/11
Ta có:5x11=55;4x13=52
Do 55>52
=>\(\dfrac{5}{13}>\dfrac{4}{11}\)
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 mau so va tu so. hay so sanh pha so sau .4\9va 3\10
4/9=0,4444444444444444444444.
3/10=0,3
4/9>3/10.
So sanh cac phan so duoi day:
a,12/13 va 11/14
b,19/20 va 39/28
c,15/25 va 5/7
d,15/7 va 9/14
e, 899/900 va 1235/1236
Giai ho Diep nhe,cang nhanh cang tot,cam on truoc nha!
\(a,\)\(\frac{12}{13}vs\frac{11}{14}\)
\(MSC=182\)
\(\frac{12}{13}=\frac{12.14}{13.14}=\frac{168}{182}\)
\(\frac{11}{14}=\frac{11.13}{14.13}=\frac{143}{182}\)
\(\frac{168}{182}>\frac{143}{182}\Rightarrow\frac{12}{13}>\frac{11}{14}\)
số hơi to !!
tóm lại là bạn quy đồng mẫu số ( tính máy tính ) rồi so sánh.