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\(=\frac{1}{2}+\frac{3}{4}-\frac{3}{4}+\frac{4}{5}\)
\(=\frac{1}{2}+0+\frac{4}{5}\)
\(=\frac{5}{10}+\frac{8}{10}=\frac{13}{10}=1\frac{3}{10}\)
\(\frac{1}{2}+\frac{3}{4}-\left(\frac{3}{4}-\frac{4}{5}\right)\)
\(=\frac{1}{2}+\frac{3}{4}-\frac{3}{4}+\frac{4}{5}\)
\(=\frac{1}{2}+0+\frac{4}{5}\)
\(=\frac{13}{10}\)
1) 5 + (-4) = 1
2) (-8) + 2 = -6
3) 8 + (-2) = 6
4) 11 + (-3) = 8
5) (-11) + 2 = -9
6) (-7) + 3 = -4
7) (-5) + 5 = 0
8) 11 + (-12) = -1
9) (-18) + 20 = 2
10) (15) + (-12) = 3
11) (-17) + 17 = 0
12) 16 + (-2) = 14
13) (30) + (-14) = 16
14) (-19) + 20 = 1
15) (-18) + 15 = -3
16) (10) + (-6) = 4
17) (-28) + 14 = -14
18) 15 + (-30) = -15
19) (15) + (-4) = 11
20) (-21) + 11 = -10
21) 8 + (-22) = -14
22) (-15) + 4 = -11
23) (-3) + 2 = -1
24) 17 + (-14) = 3
25) 17 + (-14) = 3
a: \(\dfrac{3}{5}-\dfrac{7}{4}=\dfrac{12}{20}-\dfrac{35}{20}=\dfrac{-23}{20}\)
b: \(\dfrac{4}{5}:\dfrac{-8}{15}=\dfrac{-4}{5}\cdot\dfrac{15}{8}=\dfrac{-60}{40}=\dfrac{-3}{2}\)
c: \(=7+\dfrac{5}{9}-2-\dfrac{3}{4}-3-\dfrac{5}{9}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
d: \(=\dfrac{-3}{7}\left(\dfrac{4}{19}+\dfrac{15}{19}\right)+\dfrac{5}{7}=\dfrac{2}{7}\)
\(5:\dfrac{3}{4}-4=5.\dfrac{4}{3}-4=\dfrac{20}{3}-4=\dfrac{80}{12}-\dfrac{48}{12}=\dfrac{8}{3}\)
\(\dfrac{4}{5}:\dfrac{3}{4}=\dfrac{4}{5}.\dfrac{4}{3}=\dfrac{16}{15}\)
\(5:\dfrac{3}{4}-4\dfrac{4}{5}:\dfrac{3}{4}\)
=\(5.\dfrac{4}{3}-4\dfrac{4}{5}.\dfrac{4}{3}\)
=\(\dfrac{4}{3}.\left(5-4\dfrac{4}{5}\right)\)
=\(\dfrac{4}{3}.\left(1-\dfrac{4}{5}\right)\)=\(\dfrac{4}{3}.\dfrac{1}{5}=\dfrac{4}{15}\)