* Tính hợp lí :
77+54+967+946+5033
341 * 67 + 341 * 16 + 659 * 83
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\(=341\cdot\left(-67+16\right)+659\cdot83=341\cdot\left(-51\right)+659\cdot83=37306\)
\(341.\left(-67+16\right)+659.83=341.\left(-51\right)+659.83=37306\)
\(341.67+341.16+659.83\)
\(=341.\left(67+16\right)+659.83\)
\(=341.83+659.83\)
\(=\left(341+659\right).83\)
\(=1000.83\)
\(=83000\)
341 . 67 + 341 . 16 + 659 . 83
= 341 . ( 67 + 16 ) + 659 . 83
= 341 . 83 + 659 . 83
= ( 341 + 659 ) x 83
= 1000 x 83
= 83000
a) 341 . 67 + 341 . 16 + 659 . 83
= 341 . (67 + 16) + 659 . 83
= 341 . 83 + 659 . 83
= 83 .( 341+659)
= 83 . 1000 = 83000
b) 42 .53+ 47 . 156 -47 . 114
= 42 . 53 + 47. ( 156 -114)
=42 . 53 + 47 . 42
= 42 .(53 +47)
= 42 .100 =4200
a, \(341.67+341.16+659.83\)
\(=341\left(67+16\right)+659.83\)
\(=341.83+659.83\)
\(=83\left(341+659\right)\)
\(=83.1000=83000\)
b, \(42.53+47.156-47.114\)
\(=42.53+47\left(156-114\right)\)
\(=42.53+47.42\)
\(=42\left(53+47\right)\)
\(=42.100=4200\)
Chúc bạn học tốt!
341*67+341*16+659*83
=341*(67+16)+659*83
=341*83+659*83
=89*(341+659)
=89*1000
=89000
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.
341 x 67 + 341 x 16 + 659 x 83
= 341 x (67 + 16) + 659 x 83
= 341 x 83 + 659 x 83
= (341 + 659) x 83
= 1000 x 83
= 83000
341 x 16 + 341 x 67 + 659 x 83
= 341 x ( 16 + 67 ) + 659 x 83
= 341 x 83 + 659 x 83
= ( 341 + 659 ) x 83
= 1000 x 83
= 83000
27 x 72 + 27 x 27 +27
= 27x 72 + 27x 27 + 27 x 1
= 27 x ( 72 + 27 + 1 )
= 27 x 100
= 2700
hok tốt
\(77+54+967+946+5033=\left(967+5033\right)+\left(946+54\right)+77=6000+1000+77=7077\)
\(341.67+341.16+659.83=341\left(67+16\right)+659.83=341.83+659.83=83\left(341+659\right)=83.1000=83000\)
b: Ta có: \(341\cdot67+341\cdot16+659\cdot83\)
\(=341\cdot83+659\cdot83\)
=83000