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a) 1032-[314-(314+32)]
= 1032-[314-346]
= 1032- (-32)
= 1064
b) 12-11+15-27+11
= 1+15-27+11
= 16 - 27 + 11
= (-11) + 11
= 0
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A = 51 − 314 + 213 ; A = 51 − 314 − 213 B = 51 + 213 − 314 ; C = 51 + 314 − 213 ; D = 51 + 213 − 314 ; D = 51 + 213 − 314 E = 51 − 314 − 213 ; E = 51 − 314 + 213 F = 51 − 213 − 314. V ậ y A = F ; B = E = D
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a) 5 13 + − 5 7 + − 20 41 + 8 13 + − 21 41 = 5 13 + 8 13 + − 20 41 + − 21 41 + − 5 7 = − 5 7
b) 1 28 + − 1 14 + 3 28 + − 1 7 + 3 14 = 1 28 + 3 28 + − 1 14 + 3 14 + − 1 7 = 1 7
c) 1 2 + − 2 3 + 3 4 + − 4 5 + 5 6 + − 5 6 + 4 5 + − 3 4 + 2 3 + − 1 2 = 1 2 + − 1 2 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0
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A) 57.39 + 43.39 - 57.11 - 43
= 57.(39 - 11) + 43.(39 - 1)
= 57.28 + 43.38
= 57.28 + 43.(28 + 10)
= 57.28 + 43.28 + 43.10
= 28.(57 + 43) + 430
= 28.100 + 430
= 2800 + 430
= 3230
B) 547 - 1378 - 2547 + 2378 + 117
= (2378 - 1378) - (2547 - 547) + 117
= 1000 - 1000 + 117
= 0 + 117
= 117
C) -462 + [(-814) + 462 + 314]
= -462 - 814 + 462 + 314
= (-462 + 462) - (814 - 314)
= 0 - 500
= -500
D) [461 + (-148) + 80] + (-461)
= 461 - 148 + 80 - 461
= (461 - 461) - (148 - 80)
= 0 - 68
= -68
E) 1152 - (-374 + 1152) + (-65 + 374)
= 1152 + 374 - 1152 - 65 + 374
= (1152 - 1152) + (374 + 374) - 65
= 0 + 748 - 65
= 683
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a ) 7 9 − 6 9 = 1 9 b ) 2 − 5 − 2 15 = − 8 15
c ) − 11 14 − − 4 7 = − 3 14 ; d ) 4 21 − 1 3 = − 1 7
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a) 6 2010 : 6 10 = 6 2000
b) ( 3 8 . 3 16 ) : ( 3 7 . 3 14 ) = 3 24 : 3 21 = 3 3
c) ( 2 26 : 2 10 ) : ( 2 18 : 2 16 ) = 2 16 : 2 2 = 2 14
d) 25 3 : 125 = ( 25 . 25 . 25 ) : 5 3 = 5 6 : 5 3 = 5 3