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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/(15+37)+(52-37-17)=15+37+52-37-17=50
b/(38-42+14)-(38-42-15)=38-42+14-38+42+15=29
15 + 37 + 52 - 37 - 17
= 15 + 37 - 37 + 52 - 17
= 15 + 0 + 52 - 17
= 67 - 17
= 50
b) 38 - 42 + 14 - 38 + 42 + 15
= 38 -38 + 42 - 42 + 14 + 15
= 0 + 0 + 14 + 15
= 29
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1 . (15+37)+(52-37-17)
= 15+37+52-37-17
=(15-17)+(37-37)+52
= -2+0+52 = 50
2. (27+65)+(346-27-65)
= 27+65+346-27-65
=(27-27)+(65-65)+346
=0+0+346
=346
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a.( 15 + 37 ) + ( 2 - 37 - 17 )
= 15 + 37 + 52 - 37 - 17
= 15 + (37 - 37) + (52 - 17)
= 15 + 0 + 35
= 50
b.- ( 21 - 32 ) - ( -12 + 32 )
= 21 + 32 + 12 - 32
= ( 21 + 12 ) + ( 32 - 32 )
= 9 + 0
= 9
c ( 38 - 42 + 14) - ( 25 - 27 - 15 )
= 38 - 42 + 14 + (-25) + 27 + 15
= (38 - 42 + 14) + [( -25 ) + 15] + 27
= 10 + (-10) + 27
= 0 + 27
= 27
#ht
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a)(15 + 37) + (52 -37 -17)
=52+ -2
=50
b) (38- 42 +14) - (23 -21 +10)
=10- 12
=-2
c)- (21 -32) - ( -12 +32)
=10 - 20
=-9
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. (15+37)+(52-37-17) = 15+37+52-37-17
= 15+(37-37)+52-17
= 15+0+35
= 50
42.(52 - 17) - 52.(42 - 17)
= 42.35 - 52 . 25
= 42.25 . 1,4 - 52.25
= 58,8 . 25 - 52.25
= (58,8 - 52) .25
= 6,8 .25
= 170
k mik nha
42 . ( 52 - 17 ) - 52 . ( 42 - 17 )
= 42 . 52 - 42 . 17 - 52 . 42 - 52 . 17
= [( 42 . 52 ) . 42 - 52 ] - [( - 42 . 17 ) . 42 . 17 ]
= 0 - 0
= 0