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Phân số nào không bằng 21/35
A.9/5
B.12/20
C.3/5
D.3/8
HT và $$$
\(\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{75}{100}+\frac{40}{25}+\frac{20}{48}\)
\(=\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{3}{4}+\frac{8}{5}+\frac{5}{12}\)
\(=\left(\frac{5}{4}+\frac{3}{4}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{5}+\frac{8}{5}\right)\)
\(=\frac{8}{4}+\frac{12}{12}+\frac{15}{5}\)
\(=2+1+3\)
\(=6\)
Đặt A=5/4 + 7/12 + 7/5 + 75/100 + 40/25 + 20/48
=>A=125/100 + 28/48 + 35/25 + 75/100 + 40/25 + 20/48
=>A=(125/100 + 75/100) + (28/48 + 20/48) + (35/25 + 40/25)
=>A= 2 + 1 + 3
=>A= 6
Vậy A=6
\(\frac{2}{5}=\frac{12}{30}=\frac{40}{100}\)
\(\frac{4}{7}=\frac{12}{21}=\frac{20}{35}\)
nha
anh bn
\(\frac{2}{5}\)\(=\)\(\frac{12}{30}\)\(;\)\(\frac{4}{7}\)\(=\)\(\frac{12}{21}\)\(Done\)
\(\dfrac{20}{35}\text{=}\dfrac{4}{7}\)
\(\dfrac{5}{15}\text{=}\dfrac{1}{3}\)
\(\dfrac{12}{21}\text{=}\dfrac{4}{7}\)
\(\dfrac{8}{10}\text{=}\dfrac{4}{5}\)
\(\dfrac{20}{30}\text{=}\dfrac{2}{3}\)
\(\Rightarrow\left(\dfrac{20}{35}\text{=}\dfrac{12}{21}\text{=}\dfrac{4}{7}\right);\left(\dfrac{20}{30}\text{=}\dfrac{2}{3}\right).\)
a.245 x ( 327-18-9) = 245 x 300 = 73500
b. (462 - 62) x 4 = 1600
c. 900 : 9 = 100
d. (12+20) : 4 = 8
245x327-245x18-9x245 462 x 4 - 62 x 4
=245x(327-18-9) = ( 462 - 62) x 4
=245x300 = 400 x 4
=73500 = 1600
35 : 7 - 21 : 7 ( 25 x 36 ) : 9
= ( 35 - 21) : 7 = 900 : 9
= 14 : 7 = 100
= 2
12 : 4 + 20 : 4
= ( 12 + 20 ) : 4
= 32 : 4
= 8