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8/3.2/5.3/8.10.19/92=8.2.3.10.19/3.5.8.92=2.19/46=19/23
\(=\frac{16}{15}.\frac{15}{4}.\frac{19}{92}=4.\frac{19}{92}=\frac{76}{92}=\frac{19}{23}\)
NHỚ K GIÚP MK HA
\(\frac{-40}{8}\) và \(\frac{3}{8}\) ; \(\frac{-3}{9}\) và \(\frac{7}{9}\)
1=\(\frac{72}{72}\),-5 = \(\frac{-360}{72}\), \(\frac{3}{8}\)= \(\frac{27}{72}\), \(\frac{-1}{3}\)= \(\frac{-24}{72}\), \(\frac{-7}{-9}\)= \(\frac{56}{72}\)
a, 11 1/4-(2 5/7+5 1/4)
= 45/4-(19/7+21/4)
= 45/4-223/28
=23/7
b, (8 5/11+3 5/8)-3 5/11
=(93/11+29/8)-38/11
=1063/88-38/11
=69/8
a, =\(11\frac{1}{4}-2\frac{5}{7}-5\frac{1}{4}\)
\(=\left(11\frac{1}{4}-5\frac{1}{4}\right)-2\frac{5}{7}\)
\(=6-2\frac{5}{7}\)
\(=\frac{23}{7}\)
b, \(=8\frac{5}{11}+3\frac{5}{8}-3\frac{5}{11}\)
\(=\left(8\frac{5}{11}-3\frac{5}{11}\right)+3\frac{5}{8}\)
\(=5+3\frac{5}{8}\)
\(=\frac{69}{8}\)
A) \(\frac{1}{2}\cdot\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{27}\right)\)
\(=\frac{1}{2}\cdot\frac{1}{2}\)
\(=\frac{1}{4}\)
B) \(\left(\frac{-5}{28}+1.75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)
\(=\left(\frac{-5}{28}+\frac{7}{4}+\frac{8}{35}\right):\frac{-69}{20}\)
\(=\frac{14}{5}:\frac{-69}{20}\)
\(=\frac{-56}{69}\)
a, \(\frac{-3}{7}\)+ \(\frac{2}{9}\)= \(\frac{-13}{63}\)
b, \(\frac{-5}{11}\)+ \(\frac{6}{7}\)= \(\frac{31}{77}\)
c, \(\frac{334}{335}\)+ \(\frac{-4}{335}\)= \(\frac{66}{67}\)
\(a)\frac{36}{-84}+\frac{100}{450}=\frac{-36}{84}+\frac{100}{450}\)
Rút gọn : \(\frac{-36}{84}=\frac{-36:12}{84:12}=\frac{-3}{7}\)
\(\frac{100}{450}=\frac{100:50}{450:50}=\frac{2}{9}\)
B1 : 7 = 7
9 = 32
\(\Rightarrow MSC=BCNN(7,9)=7\cdot3^2=63\)
B2 : Thừa số phụ :
63 : 7 = 9
63 : 9 = 7
B3 : Quy đồng :
\(\frac{36}{-84}=\frac{-36}{84}=\frac{-3}{7}=\frac{-3\cdot9}{7\cdot9}=\frac{-27}{63}\)
\(\frac{100}{450}=\frac{2}{9}=\frac{2\cdot7}{9\cdot7}=\frac{14}{63}\)
\(\Rightarrow\frac{-3}{7}+\frac{2}{9}=\frac{-27}{63}+\frac{14}{63}=\frac{-27+14}{63}=\frac{-13}{63}\)
b,c, Tự làm
1. \(-2+\frac{-5}{8}=\frac{-16}{8}+\frac{-5}{8}=\frac{-21}{8}\)
2. \(\frac{55}{121}+\frac{36}{-63}=\frac{5}{11}+\frac{-4}{7}=\frac{35}{77}+\frac{-44}{77}=\frac{-9}{77}\)
-2+-5/8
=-2/1+-5/8 MSC:8
=-16/8+-5/8
=-21/8
CHÚC BẠN HC THẬT TỐT!