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\(\frac{54}{60}-\frac{20}{12}=\frac{-46}{60}=\frac{-23}{30}\)
\(\frac{70}{63}+\frac{23}{12}=\frac{109}{36}\)
Bài 2
\(\frac{54}{62}=\frac{1134}{1302}\)
\(\frac{12}{21}=\frac{744}{1302}\)
k mk nha !!
\(\frac{54}{60}-\frac{20}{12}=\frac{54}{60}-\frac{20\cdot5}{12\cdot5_{ }}=\frac{54}{60}-\frac{100}{60}\)
\(=\frac{-23}{30}\)
Tương tự như thế nhé
👨👨👦 💑 👨👨👧👦 👩❤️💋👩 👩❤️💋👩 👩❤️💋👩 💑 💑 💑 💑 💑 👩❤️💋👩 🐜 🐜 🐉 🐉 🐉 🐉 🐉
a) x+ \(\frac{4}{5}\)= \(\frac{4}{5}\)+ ( \(\frac{3}{7}\)+ \(\frac{3}{5}\))
x + \(\frac{4}{5}\)= \(\frac{4}{5}\)+ \(\frac{36}{35}\)
=> x = \(\frac{36}{35}\)
Vậy : x = \(\frac{36}{35}\)
b) \(\frac{4}{9}\)+\(\frac{8}{9}\)+ \(\frac{12}{9}\)+ ... + \(\frac{56}{9}\)
= \(\frac{4+8+12+...+56}{9}\)
Ta có : 4+8+12 + ... +56
Số các số hạng của dẫy số trên là : ( 56 -4) + 4 +1 = 14 ( số hạng )
=> Tổng trên = ( 4+56) x 14 : 2 = 420
=> \(\frac{4}{9}\)+ \(\frac{8}{9}\)+ ... + \(\frac{56}{9}\)= \(\frac{420}{9}\)= \(\frac{140}{3}\)
a)x=3/7+3/5=3x(1/7+1/5)=36/35
b)=(4+8+...+56)/9=(56+4)x14/9=280/3
Tính
\(\frac{15}{25}+\frac{80}{125}+\frac{12}{42}+\frac{78}{100}+\frac{18}{12}\)
\(\frac{3}{5}+\frac{16}{25}+\frac{6}{21}+\frac{39}{50}+\frac{3}{2}\)
\(\frac{15}{25}+\frac{16}{25}+\frac{39}{50}+\frac{6}{21}+\frac{3}{2}\)
\(\frac{62}{50}+\frac{39}{50}+\frac{12}{42}+\frac{63}{42}\)
\(\frac{101}{50}+\frac{75}{42}\)
\(\frac{4242}{2100}+\frac{3750}{2100}\)
\(\frac{7992}{2100}\)
Để kết quả của phép tính trên là 0 thì :
\(\frac{32}{46}\)X x - \(\frac{16}{23}\)X \(\frac{21}{23}\)= 0
\(\frac{16}{23}\)X x - \(\frac{16}{23}\)X \(\frac{21}{23}\)= 0
\(\frac{16}{23}\)X ( x - \(\frac{21}{23}\)) = 0
x - \(\frac{21}{23}\)= 0 ( chia cả 2 vế cho \(\frac{16}{23}\))
x = 0 + \(\frac{21}{23}\)
x = \(\frac{21}{23}\)
Vậy x = \(\frac{21}{23}\)
\(\frac{21}{8}=2\frac{5}{8};\frac{30}{12}=2\frac{1}{2};\frac{54}{16}=4\frac{1}{1}\)
Đáp án lần lượt là: \(\frac{23}{36};\frac{31}{7};\frac{1}{6};\frac{3}{5}\)
#Hk_tốt
#Ken'z
\(\frac{8}{5}-\frac{18}{27}\)
\(=\frac{8}{5}-\frac{2}{3}\)
\(=\frac{24}{15}-\frac{10}{15}\)
\(=\frac{14}{15}\)
\(\frac{12}{20}-\frac{6}{18}\)
\(=\frac{3}{5}-\frac{1}{3}\)
\(=\frac{9}{15}-\frac{5}{15}\)
\(=\frac{4}{15}\)
\(\frac{8}{24}-\frac{5}{25}\)
\(=\frac{1}{3}-\frac{1}{5}\)
\(=\frac{5}{15}-\frac{3}{15}\)
\(=\frac{2}{15}\)
\(\frac{18}{21}-\frac{12}{27}\)
\(=\frac{6}{7}-\frac{4}{9}\)
\(=\frac{54}{63}-\frac{28}{63}\)
\(=\frac{26}{63}\)
1)8/5-2/3=14/15
2)3/5-1/3=4/15
3)1/3-1/5=2/15
4)6/7-4/9=26/63
\(\frac{56}{78}\)\(=\)\(\frac{56.27}{78.27}\)\(=\)\(\frac{1512}{2106}\)
\(\frac{43}{27}\)\(=\)\(\frac{43.78}{27.78}\)\(=\)\(\frac{3354}{2106}\)
\(D\text{ấu}\)\(ch\text{ấm}\)\(ngh\text{ĩa}\)\(l\text{à}\)\(d\text{ấu}\)\(nh\text{â}n\).
tk nha bạn !
Mẫu số chung là 78x27=2106
\(\frac{56}{78}=\frac{56x27}{78x27}=\frac{1512}{2106}\)
\(\frac{43}{27}=\frac{43x78}{27x78}=\frac{3354}{2106}\)
54/12:64/12=27/32
56/45x54/51=112/85
56/20+58/21=584/105
21/78-12/78=3/26
a).27/32
b).336/305
c).584/105
d).3/26