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Ta có
\(27-\left[20-\left(36-30^2\right)\right]=27-\left(20-6^2\right)=27-\left(20-36\right)\)
\(27-\left(-16\right)=27+16=43\)
b)\(119+\left(-213\right)+212+\left(-118\right)+2012=\left[119+\left(-118\right)\right]+\left[213+\left(-212\right)\right]+2012\)\(1+\left(-1\right)+2012=2012\)
Tick nha nguyen hoang le thi
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M = 119 - 213 + 212 - 118 + 2009
= ( 119 - 118 ) - ( 213 - 212 ) + 2009
= 1 - 1 + 2009
= 2009
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a/ A= 119+(-213)+212+(-118)+2009
A= ! - 1 + 2009
A= 2009
b/ B=223+132+187-23-32-87
B = 200 + 100 + 100
B = 400
c/ C= -2012+(-596)+(-201)+496+301
C = -2012 - 100 + 100
C = -2012
d/ D= -329+(15-101)-(25-440)
D = 0
hok tốt!!!
\(a,A=119+\left(-213\right)+212+\left(-118\right)+2009\)
\(A=\left(119+212+2009\right)+\left[\left(-213\right)+\left(-118\right)\right]\)
\(A=2340+\left(-331\right)\)
\(A=2009\)
\(b,B=223+132+187-23-32-87\)
\(B=\left(223+132+187\right)+\left(-23-32-87\right)\)
\(B=542-142\)
\(B=400\)
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2+4+6+8+10+...+118+120
=(120+2).[(120-2):2+1]:2
=122.60:2
=6720:2
=3360
2+4+6+8+10+..+118+120
=(120+2).[(120-2):2+1]:2
=122.60:2
=7320:2
=3660
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a. 39. 213+ 87 .39 b. 80- [ 130 - (12 - 42)]
= 39 .( 213 +87) =80-[ 130- (12- 16)
=39. 300 =80-[ 130 - (-4)]
= 11700 =80- 134= -54
a\39.213+87.39 =>=39.(213+87) =>=39.300 =11700 b\80-[130-(12-42 )] =80-[130-(12-16)] =80-[130-(-4)] =80-134 = -54
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119+(-213)+212+(-118)+2012=(-94)+212+(-118)+2012=118+(-118)+2012=0+2012=2012