23 * 19 - 23 * 14 + 12018
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Sửa đề: \(\dfrac{2}{17}+\dfrac{15}{23}+\dfrac{15}{17}+\dfrac{4}{19}+\dfrac{8}{23}\)
\(=\left(\dfrac{2}{17}+\dfrac{15}{17}\right)+\left(\dfrac{15}{23}+\dfrac{8}{23}\right)+\dfrac{4}{19}\)
\(=1+1+\dfrac{4}{19}\)
\(=2+\dfrac{4}{19}\)
\(=\dfrac{42}{19}\)
\(#Tmiamm\)
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1: =1-1+5-5+7-7+8-8=0
2: =14-23+5+14-5+23+17
=28+17=45
3: =12-12+9-9+14-44-3=-33
4: =22-8-8-12+4
=22-16-8
=-2
Bài \(1\)
\(1)\) \(1-5+7-8+4-1+5-7+8\)
\(=(1-1)+(5-5)+(7-7)+(8-8)\)
\(=0+0+0+0\)
\(=0\)
\(2)\) \(14-23+(5+14)-(5-23)+17\)
\(=14-23+5+14-5+23+17\)
\(=(14+14)+(23-23)+(5-5)+17\)
\(=28+17\)
\(=45\)
\(3)\) \(12-44+9-3+14-19-9-12\)
\(=(12-12)+(9-9)+(14-44)+3\)
\(=-30+3\)
\(=-33\)
\(4)\) \(22-(4-8+12)+(-8-12+4)\)
\(=22-4+8-12-8-12+4\)
\(=22+(4+4)+(8-8)+(-12-12)\)
\(=22-24\)
\(=-2\)
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a) 2763 + 152=2915
b) (-7) + (-14)=-21
c) (-35) + 35=0
d) (-5) + (-248)=-253
e) (-23) + 105=82
f) 78 + (-123)=-45
g) 23 + (-13)=10
h) (-23) + 13=-10
i) 26 + (-6)=20
j) 12 – 34=-22
k) -23 – 47=-70
l) 31 – (-23)=54
m) -9 – (-5)=-4
n) 6 – (8 – 17)=15
o) 19 + (23 – 33)=9
p) (-12 – 44) + (-3)=-59
q) 4 – (-15) –(-25)=44
r) -7 -14 – 26 –(-28)=-19
\(2^3.19-2^3.14+1^{2018}\)
= \(8.19-8.14+1\)
= \(8.\left(19-14\right)+1\)
= \(8.5+1\)
= \(40+1\)
= \(41\)
Chúc bạn học tốt !!!