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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: \(72\cdot56+56\cdot28=56\left(72+28\right)=5600\)
b: \(53\cdot125-24\cdot53-53=53\left(125-24-1\right)=5300\)
c: \(42\cdot53+47\cdot156-47\cdot114=42\cdot53+47\cdot42=4200\)
d: \(28\cdot76+28\cdot25+28=28\cdot\left(76+25+1\right)=2800\)
e: \(37\cdot59-37\cdot3+37\cdot49=37\left(59-3+49\right)=3885\)
a) 38 + 41 + 117 + 159 + 62
= ( 38 + 62 ) + ( 41 + 159 ) + 117
= 100 + 200 + 117
= 300 + 117
= 417
b) 42 x 53 + 47 x 156 - 47 x 144
= 47 x ( 156 - 144 ) + 42 x 53
= 47 x 12 + 42 x 53
= 564 + 2226
= 2790
c) 341 x 67 + 341 x 16 + 659 x 83
= 341 x ( 67 + 16 ) + 659 x 83
= 341 x 83 + 659 x 83
= 83 x ( 341 + 659 )
= 83 x 1000
= 83000
hok tốt
1.a)341.67+341.16+659.82
=341.(67+16)+659.82
=341.83+659.82
=341+341.82+659.82
=341+82.(341+659)
=341+82.1000
=82341
b)42.53+47.156-47.114
=42.53+47.(156-114)
=42.53+47.42
=42.(53+47)
=42.100
=4200
c ) = (1 - 2 ) + ( 3 - 4 ) + ......... + ( 209 - 210 ) + 211
= -1 + -1 + -1 ........ + -1 + 211 ( có 105 số - 1)
= -1 x 105 + 211
= - 105 + 211
= 106
b ) = 1152 - 374 - 1152 + -65 + 374
= ( 1152 - 1152 ) + ( 374 - 374 ) + -65
= 0 + 0 + -65
= 0 +-65
= -65
a ) 4 3 7 : 2 5 .4 3 7 = 4 3 7 : 4 3 7 : 2 5 = 1 : 2 5 = 5 2 .
b ) 3 2 9 . 15 23 .1 7 29 : 5 23 = 3 2 9 .1 7 29 . 15 23 : 5 23 = 5.3 = 15
B) 42.53+47.156-47.114
=42.53+47(156-114)
=42.53+47.42
=42(53+47)
=42.100
=4200
341.67+341.6+659.83
=341.(67+6)+659.83
=341.83+659.83
=(341+659).83
=1000.83
=83000.
42.53+47.156-47.114
=42.53+47.(156-114)
=42.53+47.42
=42.(53+47)
=42.100.
NẾU ĐÚNG THÌ K OK OK OK OK
=4200