a) 58.75 + 58.50 – 58.25.34
b) 27.39 + 27.63 – 2.27a)
c) 128.46 + 128.32 + 128.22
d) 66.25 + 5.66 + 66.14 + 33.66
e) 12.35 + 35.182 – 35.94
Những câu hỏi liên quan
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Đọc tiếp
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
a,
58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58. (125 - 25)
= 58.100
= 5800
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b, 27.39 + 27.63 - 2.27
= 27.(39 + 63 - 2)
= 27.(102 - 2)
= 27.100
= 2700
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c, 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128.(78 + 22)
= 128.100
= 12800
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Tính nhanh:
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Áp dụng công thức này là được :
m.a+m.b+m.c = m(a+b+c)
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a) 58.75 + 58.50 - 58.25
= 58. (75 + 50 - 25)
= 58. 100
= 5800
b) 27.39 + 27.63 + 2.27
= 27. (39 + 63 - 2)
= 27. 100
= 2700
c) 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128. 100
= 12800
d) 12.35 + 35.182 - 35.94
= 35.(12 + 182 - 94)
= 35. 100
= 3500
e) 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
f) 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g) 17.93 + 116.83 + 17.23
= 17.(93 + 23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
h) 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 47.100
= 4700
i) 87.23 + 13.93 + 70.87
= 87.(23 + 70) + 13.93
= 87.93 + 13.93
= 93.(87 + 13)
= 93.100
= 9300
#NgHn
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a) 29.75.2 +58.50 - 58.25
b)9.39.3 + 27.63 - 2.27
c) 64.46.2 + 16.32.8 + 128.22
d) 6.25.11 + 5.22.3 + 66.14 + 33.66
e) 12.35 + 35.182 - 35.94
f) 48.19 + 48.115 + 134. 52
g) 27.121 - 87.27 + 73.34
h) 125.98 - 125.46 - 52.25
a, 5800
b, 2700
c, 12800
d, 5082
e, 10080
f, 13400
g, 5020
h, 5200
a) 29.75.2+58.50-58.25 b) 9.39.3+27.63-2.27
= (29.2).75+58.50-58.25 = (9.3).39+27.63-2.27
= 58.75+58.50-58.25 = 27.39+27.63-2.27
= 58.(75+50-25) = 27.(39+63-2)
= 58.100 = 27.100
= 5800. = 2700.
c)64.46.2+16.32.8+128.22 d)6.25.11+5.22.3+66.14+33.66
= (64.2).46+(16.8).32+128.22 = (6.11).25+5.(22.3)+66.14+33.66
= 128.46+128.32+128.22 = 66.25+5.66+66.14+33.66
= 128.(46+32+22) = 66.(25+5+14+33)
= 128.100 = 66.77
= 12800. = 5082
a) 29 . 75 . 2 + 58 . 50 - 58 . 25
= (29 . 2) . 75 + 58 . 50 - 58 . 25
= 58 . 75 + 58 . 50 - 58 . 25
= 58 . (75 + 50 - 25)
= 58 . (125 - 25)
= 58 . 100
= 5800
b) 9 . 39 . 3 + 27 . 63 - 2 . 27
= (9 . 3) . 39 + 27 . 63 - 2 . 27
= 27 . 39 + 27 . 63 - 2 . 27
= 27 . (39 + 63 - 2)
= 27 . (102 - 2)
= 27 . 100
= 2700
c) 64 . 46 . 2 + 16 . 32 . 8 + 128 . 22
= (64 . 2) . 46 + (16 . 8) . 32 + 128 . 22
= 128 . 46 + 128 . 32 + 128 . 22
= 128 . (46 + 32 + 22)
= 128 . (78 + 22)
= 128 . 100
= 12800
d) 6 . 25 . 11 + 5 . 22 . 3 + 66 . 14 + 33 . 66
= (6 . 11) . 25 + 5 . (22 . 3) + 66 . 14 + 33 .66
= 66 . 25 + 5 . 66 + 66 . 14 + 33 .66
= 66 . (25 + 5 + 14 + 33)
= 66 . (30 + 14 + 33)
= 66 . (44 + 33)
= 66 . 77
= 5082
e) 12 . 35 + 35 . 182 - 35 . 94
= 35 . (12 + 128 - 94)
= 35 . (140 - 94)
= 35 . 46
= 1610
f) 48 . 19 + 48 . 115 + 134 . 52
= 48 . (19 + 115) + 134 . 52
= 48 . 134 + 134 . 52
= 134 . (48 + 52)
= 134 . 100
= 13400
g) 27 . 121 - 87 . 27 + 73 . 34
= 27 . (121 - 87) + 73 . 34
= 27 . 34 + 73 . 34
= (27 + 73) . 34
= 100 . 34
= 3400
h) 125 . 98 - 125 . 46 - 52 . 25
= 125 . (98 - 46) - 52 . 25
= 125 . 52 - 52 . 25
= (125 - 25) . 52
= 100 . 52
= 5200
TÍNH NHANH
a) 58.75+58.50-58.25
b)27.39+27.63-2.27
c)128.46+128.32+128.22
a)58.75+58.50-58.25
=58.(75+50-25)
=58.100
=5800
b)27.39+27.63-2.27
=27.(39+63-2)
=27.100
=2700
c)128.46+128.32+128.22
=128.(46+32+22)
=128.100
=12800
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a) 58.75 + 58 . 50 - 58 . 25
= 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5800
b) 27 . 39 + 27 . 63 - 2 . 27
= 27 . ( 39 + 63 - 2 )
= 27 . 100
= 2700
c) 128 . 46 + 128 . 32 + 128 . 22
= 128 . ( 46 + 32 + 22 )
= 128 . 100
= 12800
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a) 58.75 + 58.50 - 58.25 = 58(75 + 50 - 25) = 58.100 = 5800
b) 27.39 + 27.63 - 2.27 = 27(39 + 63 -2) = 27.100 = 2700
c) 128.46 + 128.32 +128.22 = 128(46 + 32 + 22) = 128.100 = 12800
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Bài 1: Tính giá trị của biểu thức sau:a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9)d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123)g) 23 + (-13) h) (-23) + 13 i) 26 + (-6)k) 19 + (23 – 33) m) (-12 – 44) + (-3) n) 4 – (-15)o) 99 – [109 + (-9)] p) (-75) + 50q (-75) + (-50) r) (-23) + 13 + ( - 17) + 57s) 14 + 6 + (-9) + (-14)Bài 2: Tính nhanh:a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66e) 12.35 + 35.182 – 35.94 g) 27.121 – 87.27 + 73.34h)...
Đọc tiếp
Bài 1: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9)
d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123)
g) 23 + (-13) h) (-23) + 13 i) 26 + (-6)
k) 19 + (23 – 33) m) (-12 – 44) + (-3) n) 4 – (-15)
o) 99 – [109 + (-9)] p) (-75) + 50
q (-75) + (-50) r) (-23) + 13 + ( - 17) + 57
s) 14 + 6 + (-9) + (-14)
Bài 2: Tính nhanh:
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27
c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66
e) 12.35 + 35.182 – 35.94 g) 27.121 – 87.27 + 73.34
h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36
Bài 3: Tìm số nguyên x, biết:
a) x - 7 = -5 b) 128 - 3 . ( x+4) = 23
c) [ (6x - 39) : 7 ] . 4 = 12 d)( x: 3 - 4) . 5 = 15
Bài 4: Tìm tổng của tất cả các số nguyên thỏa mãn:
a) -4 < x < 3 b) -5 < x < 5
c) -10 < x < 6 d) -1 ≤ x ≤ 4
e) -6 < x ≤ 4 f) -4 < x < 4
Tính nhanh
d) 66.25 + 5.66 + 66.14 + 33.66
i) 136.23 + 136.17 – 40.36 e) 12.35 + 35.182 – 35.94
j) 17.93 + 116.83 + 17.23
m) 19.27 + 47.81 + 19.20
2. Tính nhanh a,58.75 + 58.50 - 58.25 e,48.19 + 48.115+134.5b,27.39 + 27.63 - 2.27 f,125.98 - 125.46 - 52.25c,128.46 + 128.32 + 128.22 g,136.23 + 136.17 - 40.36d,66.25 + 5.66 + 66.14+ 33.66 h,1+2+3+4+5+...+ni,2+5+11+...+47+65
Đọc tiếp
2. Tính nhanh
a,58.75 + 58.50 - 58.25 e,48.19 + 48.115+134.5
b,27.39 + 27.63 - 2.27 f,125.98 - 125.46 - 52.25
c,128.46 + 128.32 + 128.22 g,136.23 + 136.17 - 40.36
d,66.25 + 5.66 + 66.14+ 33.66 h,1+2+3+4+5+...+n
i,2+5+11+...+47+65
a,58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58.100
= 5800
b,27.39 + 27.63 - 2.27
= 27.(39 + 63 - 2)
= 27.100
= 2700
c,128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128.100
= 12800
d,66.25 + 5.66 + 66.14+ 33.66
= 66.(25 + 5 + 14 + 33)
= 66.77
= 5082
i,2+5+11+...+47+65
= 2+5+11+23+47+65
= (65+5) + (23+47) + (2+11)
= 70 + 70 + 13
= 70.2 + 13
= 140 + 13
= 153
e,48.19 + 48.115+134.5
= 48.(19 + 115) + 134.5
= 48.134 + 134.5
= 134.(48 + 5)
= 134.53
=7102
f,125.98 - 125.46 - 52.25
= 125.(98 - 46) - 52.25
= 125.52 - 52.25
= 52.(125 - 25)
= 52.100
= 5200
g,136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
h,1+2+3+4+5+...+n
\(=\frac{n\left(n+1\right)}{2}\)
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2 . Tính nhanh
a) 58. 75 + 58 . 50 - 58 . 25
= 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5 800
b) 27 . 39 + 27 . 63 - 2 . 27
= 27 . ( 39 + 63 - 2 )
= 27 . 100
= 2 700
c) 128 . 46 + 128 . 32 + 128 . 22
= 128 . ( 46 + 32 + 22 )
= 128 . 100
= 12 800
d) 66 . 25 + 5 . 66 + 66 . 14 + 33 . 66
= 66 . ( 25 + 5 + 14 + 33 )
= 66 . 77
= 5082
e) 48 . 19 + 48 . 115 + 134 . 5
= 48 . ( 19 + 115 ) + 134 . 5
= 48 . 134 + 134 . 5
= 134 . ( 48 + 5 )
= 134 . 53
= 7102
f, 125 . 98 - 125 . 46 - 52 . 25
= 125 . ( 98 - 46 ) - 52 . 25
= 125 . 52 - 52 . 25
= 52 . ( 125 - 25 )
= 52 . 100
= 5 200
g, 136 . 23 + 136 . 17 - 40 . 36
= 136 . ( 23 + 17 ) - 40 . 36
= 136 . 40 - 40 . 36
= 40 . ( 136 - 36 )
= 40 . 100
= 4 000
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\(a.58.75+58.50+58.25\)
\(=58.\left(75+50-25\right)\)
\(=58.100\)
\(=5800\)
\(b.27.39+27.63-2.27\)
\(=27.\left(39+63-2\right)\)
\(=27.100\)
\(c.128.46+128.32+128.22\)
\(=128.\left(46+32+22\right)\)
\(=128.100=12800\)
\(d.66.25+5.66+66.14+33.66\)
\(=66.\left(25+5+14+66\right)\)
\(=66.110=7260\)
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tính
a, 13.(-7) d, 8.(125-3000)
b, (-8).(-25) e, 512.(2-128)-128.(-512)
c, 98-(x+4)=20 f, 66.25+5.66+66.14+33.66
g, 12.35+35.182-35.94 h, (-8537)+(1975+8537)
i, (35-17)+(17+20-35)
a: \(13\cdot\left(-7\right)=-91\)
b: \(\left(-8\right)\cdot\left(-25\right)=200\)
c: =>x+4=98-20=78
hay x=74
g: \(=35\left(12+182-94\right)=35\cdot100=3500\)
h: \(=-8537+1975+8537=1975\)
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Bài tập:Tính nhanh:
a 27.39+27.63-2.27
b 66.25+5.66+66.14+33.66
c 136.23+136.17-40.36
d 48.19+48.115+134.52
a)27.39+27.63-2.27
=27.(39+63-2)
=27.100
=2700
b) 66.25+5.66+66.14+33.66
=66.(25+5+14+33)
=66.77
=5082
c) 136.23+136.17-40.36
=136.(23+17)-40.36
=136.40-40.36
=40.(136-36)
=40.100
=4000
d) 48.19+48.115+134.52
=48.(19+115)+134.52
=48.134+134.52
=134.(48+42)
=134.100
=13400
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