Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
1.43x7/31x7=301/217
59x13/7x13=767/217
=>767/217>301/217
hay59/13>43/31
2.rút gọn -48/224 còn -3/14
rút gọn -52/247 còn -4/19
-3/14=-3x19/14x19=-57/266
-4/19=-4x14/19x14=-56/266
=>-57/266<-56/266
hay-48/244<-52/247
vậy...
Bài 1
a) \(\dfrac{3}{8}+\dfrac{5}{8}=\dfrac{8}{8}=1\)
b) \(\dfrac{3}{4}+\dfrac{-7}{16}=\dfrac{12}{16}+\dfrac{-7}{16}=\dfrac{5}{16}\)
c) \(2\dfrac{17}{20}-\dfrac{1}{2}+3\dfrac{3}{20}=\dfrac{57}{20}-\dfrac{1}{2}+\dfrac{63}{20}\)\(=\dfrac{47}{20}+\dfrac{63}{20}=\dfrac{110}{20}=\dfrac{11}{2}\)
d) \(\dfrac{2}{3}-2\dfrac{1}{8}+\dfrac{7}{24}=\dfrac{2}{3}-\dfrac{17}{8}+\dfrac{7}{24}=\dfrac{16}{24}-\dfrac{51}{24}+\dfrac{7}{24}=\dfrac{16-51+7}{24}=\dfrac{-28}{24}=\dfrac{-7}{6}\)
Bài 2 :
a) \(x-\dfrac{7}{4}=3\)
\(x=3+\dfrac{7}{4}\)
\(x=\dfrac{19}{4}\)
b) \(x-\dfrac{1}{2}=\dfrac{4}{16}\cdot\dfrac{8}{3}\)
\(x-\dfrac{1}{2}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}+\dfrac{1}{2}\)
\(x=\dfrac{5}{6}\)
c) \(\dfrac{15}{11}\div x=\dfrac{45}{22}\)
\(x=\dfrac{15}{11}\div\dfrac{45}{22}\)
\(x=\dfrac{2}{3}\)
d) \(\dfrac{8}{3}-2x=\dfrac{8}{5}-1\)
\(\dfrac{8}{3}-2x=\dfrac{3}{5}\)
\(2x=\dfrac{8}{3}-\dfrac{3}{5}\)
\(2x=\dfrac{31}{15}\)
\(x=\dfrac{31}{15}\div2\)
\(x=\dfrac{31}{30}\)
a: MN=7+5=12cm
b: MK=12/2=6cm
OK=6-5=1cm
c: Vì OK<ON
nên K thuộc tia ON
a: MN=7+5=12cm
b: MK=12/2=6cm
OK=6-5=1cm
c: Vì OK<ON
nên K thuộc tia ON
\(\left(0,75-\frac{1}{4}\right):\frac{5}{6}=\left(\frac{3}{4}-\frac{1}{4}\right):\frac{5}{6}\)
\(=\frac{1}{2}:\frac{5}{6}=\frac{3}{5}\)
C1:(0,75-1/4):5/6
=(3/4-1/4):5/6
=1/2:5/6
=3/5
C2:(0,75-1/4):5/6
=(0,75-0,25). 6/5
=0,5.1,2
= 0.6
1: \(2^3\cdot2^2\cdot2^4=2^{3+2+4}=2^9\)
2: \(2^3\cdot2\cdot2^5=2^{3+1+5}=2^9\)
3: \(10^2\cdot10^3\cdot10^5=10^{2+3+5}=10^{10}\)
4: \(x\cdot x^5=x^{1+5}=x^6\)
5: \(a^3\cdot a^2\cdot a^5=a^{3+2+5}=a^{10}\)
6: \(x^5\cdot x^4\cdot x\cdot x^7\cdot x^6=x^{5+4+1+7+6}=x^{23}\)
7: \(10\cdot10^2=10^{1+2}=10^3\)
8: \(10\cdot100\cdot10^3=10\cdot10^2\cdot10^3=10^6\)
9: \(10\cdot100\cdot10^4\cdot1000=10\cdot10^2\cdot10^4\cdot10^3=10^{10}\)
10: \(5^3:5^2=5^{3-2}=5^1\)
11: \(3^3:3^3=3^{3-3}=3^0\)
12: \(2^7:2^3=2^{7-3}=2^4\)
13: \(4^8:4^4=4^{8-4}=4^4\)
14: \(9^5:9^2=9^{5-2}=9^3\)
15: \(8^9:8^7=8^{9-7}=8^2\)
16: \(a^6:a^3=a^{6-3}=a^3\)
17: \(b^9:b^4=b^{9-4}=b^5\)