Kết quả phép tính 3/4 - 2/4 là :
→❤_ 1/4 5/8 6/16 5/16 _❤←
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3 + 3 + 3 - 3 - 3 = 3
3 - 3 - 3 : 3 + 1 = 2
3 + 3 - 3 + 3 : 3 = 2
CÒN LẠI ĐNAG NGHĨ
3 + 3 - 3 - 3 : 3 = 2
3 + 3 - 3 + 3 - 3 = 3
3 + 3 - 3 + 3 : 3 = 4
3 + 3 : 3 + 3 : 3 = 5
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{5+2}{12}=\dfrac{7}{12}\)
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{7}{12}\)
\(1-\dfrac{23}{47}=\dfrac{47}{47}-\dfrac{23}{47}=\dfrac{24}{47}\)
\(\dfrac{4}{5}x\dfrac{7}{8}=\dfrac{4x7}{5x8}=\dfrac{28}{40}=\dfrac{7}{10}\)
\(\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{8}{5}x\dfrac{4}{1}=\dfrac{32}{5}\)
2. | 11 5 20 7 13 8 14 4 10
tw . |eleven five twenty seven thirteen eight forteen four ten
9. | 1 18 3 15 6 16 12 17 19
... | one eighteen three fifteen six sixteen twelve seventeen nineteen
\(\dfrac{3}{5}:\left(\dfrac{1}{4}.\dfrac{7}{5}\right)=\dfrac{3}{5}:\dfrac{7}{20}\)
\(=\dfrac{60}{35}=\dfrac{12}{7}\)
=> D
Câu 3 : \(\dfrac{-6}{11}=>\dfrac{-11}{6}\)
\(16^2:4^2\)
\(=\left(4^2\right)^2:4^2\)
\(=4^4:4^2\)
\(=4^{4-2}\)
\(=4^2\)
==========
\(25^5:5^2\)
\(=\left(5^2\right)^5:5^2\)
\(=5^{10}:5^2\)
\(=5^{10-2}\)
\(=5^8\)
============
\(9^8:3^2\)
\(=\left(3^2\right)^8:3^2\)
\(=3^{16}:3^2\)
\(=3^{16-2}\)
\(=3^{14}\)
===========
\(a^6:a\)
\(=a^{6-1}\)
\(=a^5\)
A.1/4
A