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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
\(491.\left(267+53\right)-491.\left(153+67\right)\)
\(=491.\left[267+53-125-67\right]\)
\(=491.100=49100\)
491.(267+53)-491.(153+67)=491.(267+53-153-67)=491.100=49100
a) 491 x (267+53) - 491 x ( 153 + 67 )
=491x<(267+53) - (153+67)>
=491x<300-200>
=491x100
=49100
b) 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
=53x(39-21) - 47x(39-21)
=53x18-47x18
=18x(53-47)
=18x6
=108
bạn ơi cho mình sửa phần b) nha
b) 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
=53x(39-21) + 47x(39-21)
=53x18+47x18
=18x(53+47)
=18x100
=1800
491.(267+53) + 491.(151+67) = 491.(267+53+151+67)
= 491 . 538
= 264158
\(132.9+132=132.\left(9+1\right)=132.10=1320.\)
\(48.17+48.3=48.\left(17+3\right)=48.20=960\)
\(45.48-90.24+145=45.48-45.2.24+145=45.\left(48-2.24\right)+145\)=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
45.48-90.24+2016
= 45.2.24-45.2.24+2.24.42
= 2.24 (45+24+42)
= 2.24.111
= 5328
k cho bé nhá!
=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