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a) \(126+\left(-20\right)+2004+\left(-106\right)\)
\(=106+2004+\left(-106\right)\)
\(=0+2004=2004\)
b) \(70+69+68+...+1+0+\left(-1\right)+\left(-2\right)+...+\left(-70\right)\)
\(=\left[70+\left(-70\right)\right]+\left[69+\left(-69\right)\right]\)\(+...+\left[2+\left(-2\right)\right]+\left[1+\left(-1\right)\right]+0\)
\(=0+0+...+0+0+0=0\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot0\)
\(=0\)
Kết quả = 0 nhé, nhớ ủng hộ mh, mh đang âm diểm
~ HOK TỐT ~
\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
\(=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot0\)
\(=0\)
a) [(-13) + (-15)] + (-8)
= -28 - 8
= -36
b) 500 – (-200) – 210 - 100
= 500 + 200 – 210 - 100
= (500 + 200) - (210 + 100)
= 700 - 310
= 390
c) –(-129) + (-119) - 301 + 12
= 129 + 12 – 119 - 301
= (129 + 12) - (119 + 301)
= 141 – 420
= -279
d) 777 – (-111) – (-222) + 20
= 777 + 111 + 222 + 20
= (777 + 111 + 222) + 20
= 1110 + 20
= 1130
a) \(\left[\left(-13\right)+\left(-15\right)\right]+\left(-8\right)\)
\(=\left(-28\right)+\left(-8\right)\)
\(=-36\)
b) \(500-\left(-200\right)-210-100\)
\(=500+200-210-100\)
\(=700-210-100\)
\(=490-100\)
\(=390\)
c) \(-\left(-129\right)+\left(-129\right)-301+12\)
\(=129+\left(-129\right)-301+12\)
\(=0-301+12\)
\(=\left(-301\right)+12\)
\(=-289\)
d) \(777-\left(-111\right)-\left(-222\right)+20\)
\(=777+111+222+20\)
\(=888+222+20\)
\(=1110+20\)
\(=1130\)
\(a = \left( { - 2} \right).\left( { - 3} \right) = 2.3 = 6\)
\(b = \left( { - 15} \right).\left( { - 6} \right) = 15.6 = 90\)
\(c = \left( { + 3} \right).\left( { + 2} \right) = 3.2 = 6\)
\(d = \left( { - 10} \right).\left( { - 20} \right) = 10.20 = 200\).
m )\(-\left|-5\right|+\left(-19\right)+18+\left|11-4\right|-57\)
\(=-5-19+18+7-57\)
\(=-56\)
n ) \(126+\left(-20\right)+\left|124\right|-\left(-320\right)-\left|-150\right|\)
\(=126-20+124+320-150\)
\(=400\)
a) \(S = \left( {45 - 3756} \right) + 3756\)
\( = 45 - 3756 + 3756\)\( = 45 + \left( { - 3756} \right) + 3756 = 45 + 0 = 45\)
b) \(S = \left( { - 2021} \right) - \left( {199 - 2021} \right)\)
\( = \left( { - 2021} \right) - 199 + 2021\)\( = \left[ {\left( { - 2021} \right) + 2021} \right] - 199 = 0 - 199\)\( = - 199\)
a) 126+ (-29)+ 2004+ (-106)
= [126+ (-106)] +2004+ (-29)
= 20+ 2004- 29
= 2024-29
= 1995
b) (-199)+ (-200)+ (-201)
= -(199+200+201)
= -600
a) 126 + (-20) + 2004 + (-106)
= [126 + (-20) + (-106)] + 2004
= 0 + 2004
= 2004
b) (-199) + (-200) + (-201)
= [(-199) + (-201)] + (-200)
= (-400) + (-200)
= -600