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19: \(\left(-17\right)+7-10\)
\(=\left(-17+7\right)-10\)
=-10-10
=-20
20: \(\left(-18\right)+10+8\)
\(=\left(-18\right)+\left(10+8\right)\)
=-18+18
=0
21: \(\left(-20\right)+15+5\)
\(=\left(-20\right)+\left(15+5\right)\)
=-20+20
=0
22: \(\left(-16\right)+8+8\)
\(=\left(-16\right)+\left(8+8\right)\)
=-16+16
=0
23: \(\left(-6\right)+3-3\)
\(=\left(-6\right)+\left(3-3\right)\)
=-6+0
=-6
24: \(13+3-16\)
\(=\left(13+3\right)-16\)
=16-16
=0
1: \(\left(-5\right)+8-7=8+\left(-5-7\right)\)
=-12+8
=-4
2: \(\left(-8\right)+2+8=\left(-8+8\right)+2=0+2=2\)
3: \(\left(-1\right)+3+1\)
\(=\left(-1+1\right)+3\)
=0+3
=3
4: \(\left(-6\right)+8-14\)
\(=\left(-6-14\right)+8\)
=-20+8
=-12
5: \(\left(-4\right)+3-7\)
\(=\left(-4-7\right)+3\)
=-11+3
=-8
6: \(\left(-4\right)+5-2\)
\(=\left(-4-2\right)+5\)
=-6+5
=-1
`1,14 . 6,4 + 1,14 . 3,6 + 0,2 . 1,14 . 5`
`= 1,14 . (3,6 + 6,4 + 1)`
`= 1,14 . 11`
`= 12,54`
31: (-29)+8-9
\(=\left(-29\right)+\left(8-9\right)\)
\(=-29-1=-30\)
32: \(\left(-14\right)-6-10\)
\(=\left(-14-6\right)-10\)
=-20-10
=-30
33: \(\left(-42\right)+10+2\)
\(=\left(-42\right)+\left(10+2\right)\)
=-42+12
=-30
34: \(\left(-45\right)+25-20\)
\(=\left(-45\right)+\left(25-20\right)\)
=-45+5
=-40
35: \(\left(-60\right)+17+3\)
\(=\left(-60\right)+\left(17+3\right)\)
=-60+20
=-40
36: \(\left(-48\right)+18-10\)
\(=\left(-48+18\right)-10\)
=-30-10
=-40
câu d)
\(\dfrac{6}{5}+\left(3+\dfrac{-1}{5}\right)\\ =\dfrac{6}{5}+3+\dfrac{-1}{5}\\ =1+3=4\)
câu e)
\(-\dfrac{3}{5}+\left(-\dfrac{2}{5}+2\right)\\ =\dfrac{-3}{5}+\dfrac{-2}{5}+2\\ =-1+2=1\)
câu f)
\(\dfrac{8}{3}-\left(-\dfrac{4}{3}+3\right)\\ =\dfrac{8}{3}+\dfrac{4}{3}-3\\ =4-3=1\)
Lời giải:
g.
$=\frac{-5}{11}+\frac{-6}{11}+1=(\frac{-5}{11}+\frac{-6}{11})+1$
$=\frac{-11}{11}+1=(-1)+1=0$
h.
$=\frac{-17}{13}+\frac{4}{13}+\frac{25}{101}$
$=\frac{-13}{13}+\frac{25}{101}=(-1)+\frac{25}{101}=-(1-\frac{25}{101})$
$=\frac{-76}{101}$
i.
$=\frac{6}{7}+\frac{1}{8}-\frac{3}{16}.4=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}$
$=\frac{6}{7}+\frac{1}{8}-\frac{6}{8}=\frac{6}{7}+\frac{-5}{8}$
$=\frac{13}{56}$
CÂU A)
\(\dfrac{5}{3}+\left(7+\dfrac{-5}{3}\right)\\ =\dfrac{5}{3}+7+\dfrac{-5}{3}=7\)
CÂI B)
\(-\dfrac{7}{31}+\left(\dfrac{24}{17}+\dfrac{7}{31}\right)\\ =-\dfrac{7}{31}+\dfrac{24}{17}+\dfrac{7}{31}=\dfrac{24}{17}\)
CÂU C)
\(\dfrac{3}{7}+\left(-\dfrac{1}{5}+\dfrac{-3}{7}\right)\\ =\dfrac{3}{7}-\dfrac{1}{5}-\dfrac{3}{7}=-\dfrac{1}{5}\)
7: \(\left(-2\right)+4-3=\left(-2-3\right)+4=-5+4=-1\)
8: \(\left(-6\right)+5+5=\left(-6\right)+\left(5+5\right)=10-6=4\)
9: \(\left(-2\right)+7+1=\left(-2\right)+\left(7+1\right)=8-2=6\)
10: \(\left(-4\right)+14-10\)
\(=\left(-4-10\right)+14\)
=14-14
=0
11: \(\left(-7\right)+5+2\)
\(=\left(-7\right)+\left(5+2\right)\)
=7-7
=0
12: \(\left(-6\right)+4+2\)
\(=\left(-6\right)+\left(4+2\right)\)
=-6+6
=0