Tính nhanh
73+86+968+914+3032
Tính hợp lí 73-(-86)+968-(-914)+3032
=73+86+968+914+3032
=1000+4000+73=5073
73-(-86)+968-(-914)+3032
=73+86+968+914+3032
=73+(86+914)+(968+3032)
=73+1000+4000
=1073+4000
=5073
Thực hiện các phép tính sau bằng cách hợp lí nhất :
a) 38 + 41 + 117 + 159 + 62
b) 73 +86 +968 +914+ 3032.
c) 341.67 + 341.16 + 659.83
d) 42.53 + 47. 156-47. 114.
\(a,38+41+117+159+62\\ =\left(38+62\right)+\left(41+159\right)+117\\ =100+200+117\\ =300+117\\ =417.\\ b,73+86+914+3032\\ =73+1000+3032\\ =1073+3032\\ =5150.\\ c,314.67+314.16+659.83\\ =314.\left(67+16\right)+659.83\\ =314.83+659.83\\ =83.\left(314+659\right)\\ =83.937\\ =?\)
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) \(42.53+47.156-47.114 =42.53+47(156-114) =42.53+47.42 =42.(53+47)=42.100=4200\)
a) 38+41+117+159+62
b) 73+86+968+914+3032
c) 341x67+341x16+659x83
d) 42x53+47x156-47x114
Thực hiện các phép tính sau bằng cách hợp lý :
a,38+41+117+159+62
b,73+86+968+914+3032
c,341.67+341.16+659.83
d,42.53+47.156-47.114
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
=5073
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
= 83 000
d) 42 . 53 + 47 . 156 - 47 . 114
= 42 . 53 + 47 . ( 156 - 114 )
= 42 . 53 + 47 . 42
= 42 . ( 53 + 47 )
= 42 . 100
= 4200
Học tốt !!!
=))
Tính nhanh:
a. 79 + 243 + 21
b. 127 + 760 + 73 + 40
c.73 + 86 + 968 + 914 + 3032
d. 40 + 41 + 42 + ... + 50
e. 1 + 2 + 3 + 4 + 5 ... + 200
e) \(1+2+3+...+200\)
\(=\frac{\left(200+1\right).\left[\left(200-1\right)+1\right]}{2}\)
\(=20100\)
\(a)79+243+21\)
\(=\left(79+21\right)+243\)
\(=100+243\)
\(=343\)
a) 79 + 243 + 21
= 343
b) 127 + 760 + 73 + 40
= 1000
c) 73 + 86 + 968 + 914 + 3032
= 5073
d) 40 + 41 + ...+50
= 495
e) 1 + 2 + 3 + ... + 50
= 1275.
phép tính giao hoán nha
38+41+117+159+62=?
73+86+968+914+3032=?
341.67+341.16+659.83=?
42.53+47.156+47.114=?
bạn nào giải nhanh mà đúng minh sẽ tich cho 5 lần đúng
a) 38 + 41 + 117 + 159 + 62 = ( 38 + 62 ) + ( 159 + 41 ) + 117 = 100 + 200 + 117 = 300 + 117 = 417
b) 73 + 86 + 968 + 914 + 3032 = ( 914 + 86 ) + ( 3032 + 968 ) + 73 = 1000 + 4000 + 73 = 5000 + 73 = 5073
c) 341 x 67 + 341 x 16 + 659 x 83 = 341 x ( 67 + 16 ) + 659 x 83 = 28303 + 54679 = 82982
d) 42 x 53 + 47 x 156 + 47 x 114 = 47 x ( 156 + 114 ) + 42 = 12690 + 42 = 12732
38+41+117+159+62 73+86+968+914+3032
=(38+62)+(41+159)+117 =(86+914)+(968+3032)+73
=100+200+117 =1000+4000+73
=300+117 =5000+73
=417 =5073
341.67+341.16+659.83 42.53+47.156+47.114
=341.(67+16)+659.83 =47.(156+114)+42.53
=341.83+659.83 =47.270+2226
=83.(341+659) =12690+2226
=14916
=83.1000
=83000
thuc hien cac phep tinh sau bang cach hop li nhat
a] 38+41+117+159+62
b] 73+86+968+914+3032
c]341.67+34116+658+83
d]4253+47156-47114
Thực hiện phép tính sau bằng cách hợp lí:
a.38+41+117+159+63
b.73+86+968+914+3032
c.314.67+341.16+659.83
d.42.53+47.156-47.114
Chú ý các dấu chấm trên phép tính là dấu nhân những người lớp 6 sẽ biết.
. Thực hiện các phép tính sau một cách hợp lí nhất:
a) 38 + 41 + 117 + 159 + 62 ;
b) 73 + 86 + 968 + 914 + 3032 ;
c) 341 . 67 + 341 . 16 + 659 . 83 ;
e) 563.23 + 23.36 + 23
f) 132 + 157 + 43 + 68
g) 49 . 68 + 100 . 34 + 68
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.