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a) 86 + 357 + 14 = (86 + 14) + 357
= 100 + 357
= 457
b) 25 . 13 . 4 = (25 . 4) . 13
= 100 . 13
= 1300
c) 28 . 64 + 28 . 36 = 28 . (64 + 36)
= 28 . 100
=2800
a) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 537
= 637
b)25 . 13 . 4
= ( 25 . 4 ) . 13
= 100 . 13
= 1300
c) 28 . ( 64 + 36 )
= 28 . 100
= 2800
a, 3 . 5 2 - 16 : 2 2 = 3.25 - 16:4 = 75 - 4 = 71
b, 15.141 + 59.15 = 15.(141+59) = 15.200 = 3000
c, 2 3 . 17 - 2 3 . 14 = 8.17 - 8.14 = 8.(17 - 14) = 8.3 = 24
d, 20 - 30 - 5 - 1 2 = 20 - 30 - 4 2 = 20 - (30 - 16) = 20 - 14 = 6
a) 86 + 357 + 14 b) 72 + 69 + 128 c) 25.5.4.27.2 d) 28.64 + 28.36
= (86 + 14) + 357 = (72 + 128) + 69 = (25.4).(5.2).27 = 28.(36+64)
= 100 + 357 = 200 + 69 = 100.10.27 = 28.100
= 457 = 269 = 1000.27 = 27000 = 2800
a,86+357+14=[86+14]+357
=100+357
=457
b,72+69+128=[72+128]+69
=200+69
=269
c,25.5.4.27.2=[25.4].[5.2].27
=100.10.27
=1000.27
=27000
d,28.64+28.36=28.[64+36]
=28.100
=2800
Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
a) 2/9 - (1/20 + 2/9)
= 2/9 - 1/20 - 2/9
= (2/9 - 2/9) - 1/20
= 0 - 1/20
= -1/20
b) -3/14 + 2/13 + (-25/14) + (-15/13)
= (-3/14 - 25/14) + (2/13 - 15/13)
= -2 - 1
= -3
c) -3/11 + 11/8 - 3/8 + (-8/11)
= (-3/11 - 8/11) + (11/8 - 3/8)
= -1 + 1
= 0
d) 3/8 + (-1/4) - (7/12 - 1/6)
= 1/8 - 5/12
= -7/24
e) (1/3 + 12/67 + 13/41) - (79/67 - 28/41)
= 1/3 + 12/67 + 13/41 - 79/67 + 28/41
= 1/3 + (12/67 - 79/67) + (13/41 + 28/41)
= 1/3 - 1 + 1
= 1/3
a)86+357+14
=(86+14)+357
=100+357
=457.
b)72+69+128
=(72+128)+69
=200+69
=269.
c)25.5.4.27.2
=25.5.2.4.27
=25.5.8.27
=25.40.27
=1000.27
=27000.
d)28.64+28.36
=28.(64+36)
=28.100
=2800.
a, (86+14)+357
=100+357
=457
b,(72+128)+69
=200+69
=269
c,(25.4).(5.2).27
=100.10.27
=27000
d,28.(64+36)
=28.100
=2800
a) 36:32+23.22=9/8+506=(9+506.8)/8=(9+4048)/8=4057/8
b) 3.52-16:22=156-8/11=(156.11-8)/11=(1716-8)/11=1708/11
c) 80-[130-(12-4)2]=80-[130-8.2]=80-[130-16]=80-114=-34
a: 3*5^2-16:2^2
=3*25-16:4
=75-4=71
b: =2^3(17-14)
=8*3
=24
c: =15(141+59)
=15*200
=3000
d: =17(85+15)-200
=1700-200
=1500
f: =3+2^5
=3+32
=35
g: =42(39-37):42
=39-37
=2
a: 86+357+14
=100+357
=457
b: \(3\cdot52-16:22\)
\(=156-\dfrac{8}{11}=\dfrac{1708}{11}\)