1 trừ 3 phần tư
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a; 0,2.\(\dfrac{15}{36}\) - (\(\dfrac{2}{5}\) + \(\dfrac{2}{3}\)): 1%
= \(\dfrac{1}{12}\) - \(\dfrac{16}{15}\): \(\dfrac{1}{100}\)
= \(\dfrac{1}{12}\) - \(\dfrac{320}{3}\)
= \(\dfrac{1}{12}\) - \(\dfrac{1280}{12}\)
= - \(\dfrac{1279}{12}\)
b; 75% - 1\(\dfrac{1}{2}\) + 0,5 : \(\dfrac{5}{12}\)
= 0,75 - 1,5 + 1,2
= -0,75 + 1,2
= 0,45
c; 1\(\dfrac{3}{15}.0,75-\left(\dfrac{8}{15}+0,25\right)\).\(\dfrac{24}{47}\)
= \(\dfrac{28}{15}\).0,75 - \(\dfrac{47}{60}\).\(\dfrac{24}{47}\)
= \(\dfrac{7}{5}-\dfrac{2}{5}\)
= 1
d; \(\dfrac{32}{15}\): (-1\(\dfrac{1}{5}\) + 1\(\dfrac{1}{3}\))
= \(\dfrac{32}{15}\): (-\(\dfrac{6}{5}\) + \(\dfrac{4}{3}\))
= \(\dfrac{32}{15}\): \(\dfrac{2}{15}\)
= 16
Có: 7-3.\(\frac{-1}{4}^2\)
= 7-3. \(\frac{1}{16}\)
= 7- \(\frac{3}{16}\)
= \(\frac{112}{16}\)-\(\frac{3}{16}\)
= \(\frac{109}{16}\)
7/5 - a/4 = 13/20
a/4 = 7/5 - 13/20
a/4 = 3/4
=> a = 3
Vậy a = 3
4/5 x 3/4 - 3/10
= 12/20 - 3/10
= 12/20 - 6/20
= 6/20
= 3/10
\(\frac{3}{4}\times x+\frac{5}{3}\times x=\frac{7}{12}\)
\(\left(\frac{3}{4}+\frac{5}{3}\right)\times x=\frac{7}{12}\)
\(\frac{29}{12}\times x=\frac{7}{12}\)
\(x=\frac{7}{12}\div\frac{29}{12}\)
\(x=\frac{7}{29}\)
1 - 3/4 = 4/4 - 3/4 = 1/4
Chúc bạn học tốt.
😁😁😁
\(=\frac{1}{4}\)