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=491.267+491.53-491.153+491.67
=491.(267+153)-491.(53+67)
=491.420-491.120
=491.(420-120)
=491.300
=147300
45.48-90.24+145
=(45.2).(48:2)-90.24+145
=90.24-90.24+145
=0+145
=145
754.75-2262.25+4568
=754.75-(2262:3).(25.3)+4568
=754.75-754.75+4568
=0+4568
=4568
23.157+15.46-23.87
=23.(147-87)+15.46
=23.60+15.46
=23.60+(15.2).(46:2)
=23.60+50.23
=23.(60+50)
=23.110
=2530
a) 93.85+17.45-170=8500
b) 491.(267+53) -491. (153+67) =49100
c) 45.48-90.24+145=145
d) 754.75-2262.25+4568=4568
e) 23.157+15.46 -23.87=2300
132*99 + 132 = 132 * 100 = 13200
168*168-168*58/110 = 168*(168-58)/110 = 168*110/110 = 168
a) -132 + (176+132)
= -132+176+132
= -132+132+176
=0+176
= 176
b) 25. (-5).4.(-8)
= (25.4).[-5.(-8)]
= 100 . 40
= 4000
c) -37.52+37. (-48)
= -37.52+(-37).48
= -37.(52+48)
= -37.100
= -3700
d) 54 - 8.(6-23)
= 54 - 8. (-17)
= 54 - (-136)
= 54 + 136
= 190
e) -85 . 13 + 85 . 113
= 85 . (-13) + 85 . 113
= 85. (-13 + 113)
= 85.100
= 8500
f)2008-(107+2008)-75
= 2008 - 107 - 2008 - 75
= 2008 - 2008 - 107 - 75
= -107 - 75
= -182
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.
\(132.9+132=132.\left(9+1\right)=132.10=1320.\)
\(48.17+48.3=48.\left(17+3\right)=48.20=960\)
\(45.48-90.24+145=45.48-45.2.24+145=45.\left(48-2.24\right)+145\)=45.0+145=145
132 . 9 + 132 = 132 . 9 + 132 . 1 = 132 . (9 + 1) = 132 . 10 = 1320
48 . 17 + 48 . 3 = 48 . (17 + 3) = 48 . 20 = 960
45 . 48 - 90 . 24 + 145 = 45 . 48 - 45 . 2 . 24 + 145 = 45 . (48 - 2 . 24) + 145 = 45 . (48 - 48) + 145 = 45 . 0 + 145 = 0 + 145 = 145
754 . 75 - 2262 . 25 + 4560 = 754 . 75 - 754 . 3 . 25 + 4560 = 754 . (75 - 3 . 25) + 4560 = 754 . (75 - 75) + 4560 = 754 . 0 + 4560 = 4560
1050 : 15 - 350 : 5 + 176 = 70 - 70 + 176 = 0 + 176 = 176