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Bài 2:
a. $=62-81-12+59-9=(62-12)+(59-9)-81$
$=50+50-81=100-81=19$
b. $=39+13-26-62-39=(39-39)+13-(26+62)$
$=0+13-88=-(88-13)=-75$
c. $=(32-42)+(36-34)+(40-38)=10+2+2=14$
d. $=92-55+8-45=(92+8)-(55+45)=100-100=0$
Bài 1:
a. $=(387-87)-224=300-224=76$
b. $=-(75+35)+379=-110+379=379-110=269$
c. $=(11+15)-(13+17)=25-30=-5$
d. $=(31-21)-(27-24)=10-3=7$
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\(\text{( 62 - 81) - (12 - 59 + 9 ) }=\left(-19\right)-\left(-38\right)=\left(-57\right)\)
\(\left(62-81\right)-\left(12-59+9\right)\)
\(=\left(-19\right)-\left(-38\right)\)
\(=19\)
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a: \(=168:\left[180-\left(36+2^3\cdot8\right)\right]=168:80=\dfrac{21}{10}\)
b: =62-81-12+59-9
=50+50-81
=100-81
=19
c: \(=298\cdot198-298\cdot127+198\cdot127-198\cdot298\)
=127x(-100)=-12700
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a) 232 - (581 + 132 - 331)
= 232 - 581 - 132 + 331
= (232 - 132) - (581 - 331)
= 100 - 250
= -(250 - 100)
= -150
b) [12 + (-57)] - [-57 - (-12)]
= 12 - 57 + 57 - 12
= (12 - 12) + (57 - 57)
= 0 + 0
= 0
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a) 152 + (-73) - (-18) - 127 = 152 – 73 +18 -127
= (152 + 18) – (127 + 73) = 170 - 200 = -(200 - 170) = -30
b) 7 + 8 + (-9) + (-10) = (7 + 8) + [(-9) + (-10)]
= 15 + (-19) = -(19 - 15) = -4.
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a) (-2 019) + (-550) + (-451) = [(-2 019) + (-451)] + (-550) = (-2 470) + (-550) = -(2 470 + 550) = -3 020
b) (-2) + 5 + (-6) + 9 = [(-2) + 5 ]+[ (-6) + 9] = 3 + 3 = 6
(62 - 81) – (12 – 59 + 9) = 62 - 81 - 12 + 59 - 9 = 19