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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
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a) \(18+25\times4-4^3\)
\(=18+100-64\)
\(=118-64\)
\(=54\)
b) \(275-\left(49+125\div5^3\right)\)
\(=275-\left(49+125\div125\right)\)
\(=275-\left(49+1\right)\)
\(=275-49-1\)
\(=226-1\)
\(=225\)
c) \(2015+\left(8\times15-\left(18-8\right)^2\right)\)
\(=2015+\left(8\times15-\left(10\right)^2\right)\)
\(=2015+\left(8\times15-100\right)\)
\(=2015+\left(120-100\right)\)
\(=2015+20\)
\(=2035\)
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a) \(\frac{3}{4}+\left(\frac{-1}{3}\right)-\frac{5}{18}=\frac{5}{36}\)
b) \(-2+\left(\frac{-5}{8}\right)+\frac{3}{4}=\frac{-15}{8}\)
c) \(\frac{15}{8}.\frac{12}{5}-\frac{11}{3}=\frac{5}{6}\)
d) \(\frac{6}{7}+\frac{5}{7}:5-\frac{8}{9}=\frac{1}{9}\)
mk chỉ đưa ra kp thôi!
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a)\(12-\left[25+\left(6+3\right)^2\right]\)
\(=12-\left[25+9^2\right]\)
\(=12-\left[25+81\right]\)
\(=12-106\)
\(=\left(-94\right)\)
b) \(315-\left(8^6\div8^4-12.3+7+7^3\right)\)
\(=316-\left(8^2-36+7+343\right)\)
\(=316-\left(64-43+343\right)\)
\(=316-\left(21+343\right)\)
\(=316-364\)
\(=\left(-48\right)\)
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=(18+2)+(16+4)+(14+6)+(12+8)+10
=20+20+20+20+10
=20x4+10
=80+10
=90
k cho tui đi mà
2+4+6+8+10+12+14+16+18
= ( 2 + 8 ) + ( 4 + 6 ) + ( 14 + 16 ) + ( 12 + 18 ) + 10
= 10 + 10 + 30 + 30 +10
= 90 .
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a; (-5) + 11 + 17 + (-3)
= - 5 + 11 + 17 - 3
= - (5 + 3) + (11 + 17)
= - 8 + 28
= 20