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a)
$37+41+117+159+62$
$=(37+159)+(41+117)+62$
$=196+158+62$
$=416$
b)
$73+86+968+914+3032$
$=(968+3032)+(86+914)+73$
$=4000+1000+73$
$=5073$
a)38 + 41 + 117 + 159 + 62
= ( 38 + 62 ) + ( 41 + 159 ) + 117
= 100 + 200 + 117
= 300 + 117 = 417
b)73 + 86 + 968 + 914 + 3032
= ( 968 + 3032 ) + ( 86 + 914 ) + 73
= 4000 + 1000 + 73
= 5000 + 73 = 5073
c)341 . 67 + 341 . 16 + 659 . 83
= 341 . ( 67 + 16 ) + 659 . 83
= 341 . 83 + 659 . 83
= 83 . ( 341 + 659 )
= 83 . 1000
= 83000
d)42 . 53 + 47 . 156 - 47 . 114
= 42 . 53 + 47 . ( 156 - 114 )
= 42 . 53 + 47 . 42
= 42 . ( 53 + 47 )
= 42 . 100
= 4200
e)563 . 23 + 23 . 36 + 23
= 23 . ( 563 + 36 + 1 )
= 23 . 600
= 13800
f)132 + 157 + 43 + 68
= ( 132 + 68 ) + ( 157 + 43 )
= 200 + 200
= 400
g)49 . 68 + 100 . 34 + 68
= 49 . 68 + 50. 2 . 34 + 68
= 49. 68 + 50 . 68 + 68
= 68 . ( 49 + 50 + 1 )
= 68 . 100
= 6800
h)491 . (267 + 53) - 491 . (153 + 67)
= 491 . 267 + 491 . 53 - 491 . 153 - 491 . 67
= 491 . ( 267 + 53 - 153 - 67 )
= 491 . 100
= 49100
Trả lời:
a) 38 + 41 + 117 + 159 + 62 = ( 38 + 62 ) + ( 41 + 159 ) + 117 = 100 + 200 + 117 = 417
b) 73 + 86 + 968 + 914 + 3032 = 73 + ( 86 + 914 ) + ( 968 + 3032 ) = 73 + 1000 + 4000 = 5073
c) 341 . 67 + 341 . 16 + 659 . 83 = 341 . ( 67 + 16 ) + 659 . 83 = 341 . 83 + 659 . 83 = 83 . ( 341 + 659 ) = 83 . 1000 = 83000
d) 42 . 53 + 47 . 156 - 47 . 114 = 42 . 53 + 47 . ( 156 - 114 ) = 42 . 53 + 47 . 42 = 42 . ( 53 + 47 ) = 42 . 100 = 4200
e) 563 . 23 + 23 . 36 + 23 = 23 . ( 563 + 36 + 1 ) = 23 . 600 = 13800
f) 132 + 157 + 43 + 68 = ( 132 + 68 ) + ( 157 + 43 ) = 200 + 200 = 400
g) 49 . 68 + 100 . 34 + 68 = 49 . 68 + 50 . 2 . 34 + 68 = 49 . 68 + 50 . 68 + 68 = 68 . ( 49 + 50 + 1 ) = 68 . 100 = 6800
h) 491 . (267 + 53) - 491 . (153 + 67) = 491 . [ ( 267 + 53 ) - (153 + 67 ) ] = 491 . ( 267 + 53 - 153 - 67 ) = 491 . 100 = 49100
một đơn vị vận tải đã huy động 8 xe để chở 480 tấn hàng trong thời gian quy định sau khi trở được 160 tấn thì đơn vị được giao nhiệm vụ chở 640 tấn nủa .Hỏi đơn vị phải huy động thêm bao nhiêu xe?
a)
$38+41+117+159+62$
$=(38+62)+(41+159)+117$
$=100+200+117$
$=417$
\(a,38+41+117+159+62\\ =\left(38+62\right)+\left(41+159\right)+117\\ =100+200+117\\ =300+117\\ =417.\\ b,73+86+914+3032\\ =73+1000+3032\\ =1073+3032\\ =5150.\\ c,314.67+314.16+659.83\\ =314.\left(67+16\right)+659.83\\ =314.83+659.83\\ =83.\left(314+659\right)\\ =83.937\\ =?\)
Bn xem lại phần \(c,\) .
\(d,42.53+47.156-47.114\\ =42.53+47.\left(156-114\right)\\ =42.53+47.42\\ =42.\left(53+47\right)\\ =42.100\\ =4200.\)
a) \(38+41+117+159+62=(38+62)+(41+159)+117 \)
\(=100+200+117 =300+117 =417\)
b) \(73+86+968+914+3032=(86+914)+(968+3032)+73\)
\(=1000+4000+73=5073\)
c) \(341.67+341.16+659.83 =341.(67+16)+659.83 =341.83+659.83\)
\(=83.(341+659) =83.1000=83000\)
d) \(42.53+47.156-47.114 =42.53+47(156-114) =42.53+47.42 =42.(53+47)=42.100=4200\)
1a.
$A=(2015-1)(2015-2)\cdots(2015-n)$
Vì tích có $2015$ thừa số nên có thừa số
$(2015-2015)=0$
$\RightarrowA=0.$
1b.
$27a+8b-7a+12b$
$=(27a-7a)+(8b+12b)$
$=20(a+b)$
$=20\cdot100$
$=2000.$
a, ( 38 + 62 ) + ( 41 + 159 ) + 117
= 100 + 200 + 117
= 417
b, ( 968 + 3032 ) + ( 86 + 914 ) + 73
= 4000 + 1000 + 73
= 5073
c, 341 x ( 67+ 16 ) + 659 x 83
= 341 x 83 + 659 X 83
= 83 x ( 341 + 659 )
= 83 x 1000
= 83000
d, 42 x 53 + 47 x ( 156 - 114 )
= 42 x 53 + 47 x 42
= 42 x ( 53 + 47 )
= 42 x 100
4200
- a,=[38+62]+[41+159]+117 =100+200=300+117 =417 b,=[86+914]+[968+3032]+73 =1000+4000 =5000+73
=5073
a.38 + 41 + 117 + 159 + 62 = (38 + 62) + (41 + 159) + 117 = 100 + 200 + 117 = 300 + 117 = 417
b.341 x 67 + 659 x 83 + 341 x 16 = 341 x (16 + 67) + 659 x 83 = 341 x 83 + 659 x 83 = (341 + 659) x 83 = 1000 x 83 = 83000
a) 38 + 41 + 117 + 159 + 62 = ( 38 + 62 ) + ( 41 + 159 ) + 117 = 100 + 200 + 117 = 417
b) 341 . 67 + 659 . 83 + 342 . 16 = ( 341 + 659 ) . ( 67 + 83 ) . 342 . 16 = 1000 . 150 . ( 342 + 16 ) = 53 700 000
nhớ ủng hộ cho mik với nha các bn
Đáp án:
a, 38+41+117+159+6238+41+117+159+62
=(38+62)+(41+159)+117=(38+62)+(41+159)+117
=100 +200 +117=100 +200 +117
=417=417
b, 73+86+968+914+303273+86+968+914+3032
=73+(86+914)+(968+3032)=73+(86+914)+(968+3032)
=73+1000 +4000=73+1000 +4000
=5073=5073
c, 341.67+341.16+659.83341.67+341.16+659.83
=341.(67+16)+659.83=341.(67+16)+659.83
=341.83+659.83=341.83+659.83
=83.(341+659)=83.(341+659)
=83.1000=83000=83.1000=83000
d, 42.53+47.156−47.11442.53+47.156-47.114
=42.53+47.(156−114)=42.53+47.(156-114)
=42.53 +47.42=42.53 +47.42
=42.(53+47)=42.100=42.(53+47)=42.100
=4200=4200
e, 563.23+23.26+23563.23+23.26+23
=23.(563+26+1)=23.(563+26+1)
=23.600=23.600
=13800=13800
f, 132+157+43+68132+157+43+68
=(132+68)+(157+43)=(132+68)+(157+43)
=200 +200=400=200 +200=400
g, 49.68+100.34+6849.68+100.34+68
=49.68+50.68+68=49.68+50.68+68
=68.(49+50+1)=68.(49+50+1)
=68.100=6800=68.100=6800
h, 491.(267+53)+491.(151+67)491.(267+53)+491.(151+67)
=491.(267+53+151+67)=491.(267+53+151+67)
=491.538=491.538
=264158=264158
Vote mk nha.
a) \(38 + 41 + 117 + 159 + 62\) \(= (38 + 62) + (41 + 159) + 117\)
\(= 100 + 200 + 117\)
\(=417\)
b) \(73 + 86 + 968 + 914 + 3032\) \(= 73 + (86 + 914) + (968 + 3032)\)
\(= 73 + 1000 + 4000\)
\(=5073\)
c) \(341 \cdot 67 + 341 \cdot 16 + 659 \cdot 83\) \(= 341 \cdot (67 + 16) + 659 \cdot 83\)
\(= 341 \cdot 83 + 659 \cdot 83\)
\(= (341 + 659) \cdot 83\)
\(= 1000 \cdot 83\)
\(=83000\)
e) \(563 \cdot 23 + 23 \cdot 36 + 23\) \(= 563 \cdot 23 + 23 \cdot 36 + 23 \cdot 1\)
\(= 23 \cdot (563 + 36 + 1)\)
\(= 23 \cdot 600\)
\(=13800\) f) \(132 + 157 + 43 + 68\) \(= (132 + 68) + (157 + 43)\)
\(= 200 + 200\)
\(=400\)
g) \(49 \cdot 68 + 100 \cdot 34 + 68\) \(= 49 \cdot 68 + 50 \cdot 68 + 1 \cdot 68\) (vì \(100 \cdot 34 = 50 \cdot 68\))
\(= (49 + 50 + 1) \cdot 68\)
\(= 100 \cdot 68\)
\(=6800\)