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65 + [(-38) + (-65)] - [12 - (-42)]
= 65 - 38 - 65 - 12 - 42
= (65 - 65) - (38 + 42) - 12
= 0 - 80 - 12
= -92
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a) − 105 + − 25 + ( − 105 ) + 50
= 105 + 25 + ( - 105) + 50
= [105 + ( -105)] + ( 25 + 50 )
= 0 + 75 = 75
b) 465 + − 38 + − 465 − 12 − − 42
= 465 + ( - 38) + ( -465) – 12 – 42
= [ 465 + (- 465) ] – ( 12 + 42 )
= 0 – 54 = 0 + ( -54 ) = -54
c) 65. − 19 + − 19 .24 + − 19 .11
= ( - 19) . ( 65 + 24 + 11 )
= ( -19) . 100 = -1900
d) − 3 2 + 2 3 − − 5 2 + 4 3
= 9 + 8 – 25 + 64 = 56
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a)=27+65+346-27-65
=(27-27)+(65-65)+346
=0+0+346
=346
b)=42+69-17-42+17-35
=(42-42)+(17-17)+(69-35)
=0+0+34
=34
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65 +(- 38 ) + ( - 65 ) +12 - ( - 42 )
=65 - 38 - 65 + 12 + 42
=16
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Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
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g) (15 + 37) + (52 – 37 – 17) = 15 + 37 + 52 – 37 – 17 = 15 + 52 – 17 = 50 h) (38 – 42 +14) - (38 – 42 - 15) = 38 – 42 +14 - 38 + 42 + 15 = 14 + 15 = 29 i) (27 + 65 ) + (346 - 27- 65) = 27 + 65 + 346 - 27- 65 = 346 k) - (27 + 65) - (346 – 27 - 65) = -27 - 65 - 346 + 27 + 65 = -346 l) (42 – 69 + 17) - (42 + 17) = 42 – 69 + 17 - 42 - 17 = – 69 m) 24. (16 - 5) – 16. (24 – 5 ) = 24. 16 - 24 . 5 - 16 . 24 + 16. 5 = - 24 . 5 + 16. 5 = -8 . 5 = -40 n) (-12). 47 – 12 . 52 + (-12) = -12 (47 - 52 + 1) = -12 . (-4) = 48 p) 51 . (69 - 25) – 69. (51 - 25) = 51 . 69 - 51 . 25 – 69. 51 + 69. 25 = - 51 . 25 + 69. 25 = (- 51+ 69).25 = 450 |
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a)1125-374-1125-65+374
=(1125-1125)+(-374+374)-65
=0+0-65
=-65
a/ 1125-(374+1125)+(-65+374)
=1125-374+1125+(-65)+374
=[1125+1125]+[-374+374]+(-65)
=2250+0+(-65)
=2250+(-65)
=2185
b/ -23.63+23.21-58.23
=-23.(63+23-58)
=-23.28
=-644
\(65+\left[\left(-38\right)+\left(-65\right)\right]-\left[12-\left(-42\right)\right]\)
\(=65+\left(-38\right)+\left(-65\right)-12-42\)
\(=\left[65+\left(-65\right)\right]+\left(-38-12-42\right)\)
\(=0-92=-92\)
={65-65}]+[{-42+12}]+-38
=0+-54+-38
=0+-{54+38}
0+-92
-92